Variable speed control device for agricultural machinery

Abstract

The utility model provides an agricultural machinery speed change control device which comprises a gear lever mechanism and a speed change mechanism, a gear selecting flexible shaft and a gear shifting flexible shaft are arranged on the gear lever mechanism, and a gear selecting swing arm and a gear shifting swing arm are arranged on the speed change mechanism. The lower end of the gear selecting flexible shaft is in transmission connection with the gear selecting swing arm, and the gear selecting flexible shaft can drive the gear selecting swing arm to swing when moving in the axial direction of the gear selecting flexible shaft. The lower end of the gear shifting flexible shaft is in transmission connection with the gear shifting swing arm, and when the gear shifting flexible shaft moves in the axial direction of the gear shifting flexible shaft, the gear shifting swing arm can be driven to swing. When the gear lever mechanism is operated, the gear selecting flexible shaft can drive the gear selecting swing arm to swing, the gear shifting flexible shaft can drive the gear shifting swing arm to swing, and gear selecting and gear shifting are achieved. When the gear lever mechanism vibrates along with the suspension cab, the bending flexibility of the gear-selecting flexible shaft and the gear-shifting flexible shaft counteracts the vibration, so that a transmission part of the control mechanism is prevented from transmitting the vibration, the noise and the failure rate are reduced, and the control comfort is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of agricultural machinery transmission systems, specifically to an agricultural machinery transmission control device. Background Technology

[0002] In agricultural machinery such as tractors, the main function of the transmission control assembly is to enable human-machine interaction. The driver can use the control mechanism to engage the required gear to adapt to different driving speeds and road conditions. When the driver shifts or selects gears in the cab using the control lever, the control mechanism transmits the driver's actions to the transmission assembly through mechanisms such as the rotating shaft and the swing arm, thereby realizing the gear switching.

[0003] A gear shifting mechanism typically includes a gear shift lever, a lever support, and a shifting mechanism. The gear shift lever is mounted on the lever support and can swing back and forth and left and right. The lever support is installed inside the driver's cab, and the shifting mechanism is mounted on the gearbox. The gear selection rocker arm on the gear shift lever is connected to the gear selection swing arm of the shifting mechanism via a gear selection linkage mechanism. The gear selection rocker arm on the gear shift lever is connected to the gear selection swing arm of the shifting mechanism via a gear selection linkage mechanism. When the driver swings the gear shift lever left and right, the gear selection rocker arm swings and transmits the action to the gear selection swing arm; when the driver swings the gear shift lever back and forth, the gear selection rocker arm swings and transmits the action to the gear selection swing arm; thus, gear selection and shifting are achieved.

[0004] When the aforementioned general control mechanism is applied to tractor models with suspended cabs, the increased suspension of the suspended cab leads to a greater amplitude of the shift lever's vertical movement following the cab's movement. This causes vibrations and increased noise in the shift lever and its connected linkage mechanisms, reducing the driver's comfort and increasing the failure rate of the shift control mechanism. Utility Model Content

[0005] The technical problem to be solved by this utility model is: how to reduce the vibration of the gear shifting mechanism, reduce noise and failure rate.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0007] This utility model provides a gear shifting control device for agricultural machinery, including a shift lever mechanism and a gear shifting mechanism. The shift lever mechanism is provided with a gear selection flexible shaft and a gear shift flexible shaft, and the gear shifting mechanism is provided with a gear selection swing arm and a gear shift swing arm. The lower end of the gear selection flexible shaft is drivenly connected to the gear selection swing arm, and when the gear selection flexible shaft moves along its own axial direction, it can drive the gear selection swing arm to swing. The lower end of the gear shift flexible shaft is drivenly connected to the gear shift swing arm, and when the gear shift flexible shaft moves along its own axial direction, it can drive the gear shift swing arm to swing.

[0008] The beneficial effects of this utility model are:

[0009] By employing this invention, when the shift lever of the gear lever mechanism is operated, the gear lever mechanism drives the gear selection flexible shaft and the shift flexible shaft to move along their own axial direction. The gear selection flexible shaft can drive the gear selection swing arm to swing, and the shift flexible shaft can drive the shift swing arm to swing, thus realizing gear selection and shifting. When the gear lever mechanism vibrates with the suspended cab, the bending flexibility of the gear selection flexible shaft and the shift flexible shaft cancels out the vibration, avoiding the transmission of vibration by the transmission components of the operating mechanism, reducing noise and failure rate, and improving operating comfort.

[0010] Based on the above technical solution, the present invention can be further improved as follows.

[0011] Furthermore, it also includes an intermediate support, on which a gear selection intermediate rocker arm assembly and a gear shift intermediate rocker arm assembly are provided. The lower end of the gear selection flexible shaft is hinged to the gear selection intermediate rocker arm assembly, and a gear selection connecting rod is hinged to the gear selection intermediate rocker arm assembly. The gear selection connecting rod is hinged to the gear selection swing arm. The lower end of the gear shift flexible shaft is hinged to the gear shift intermediate rocker arm assembly, and a gear shift connecting rod is provided to the gear shift swing arm.

[0012] The intermediate bracket can be installed on the frame of agricultural machinery, increasing the arrangement space at the lower end of the gear selection and shifting flexible shafts and improving installation flexibility; at the same time, it avoids excessive bending of the gear selection and shifting flexible shafts, which affects their axial transmission capacity, and has good reliability.

[0013] Furthermore, the gear selection intermediate rocker arm assembly includes an intermediate rotating shaft, one end of which is provided with a first gear selection intermediate rocker arm, which is hinged to a gear selection flexible shaft; the other end of the intermediate rotating shaft passes through an intermediate bracket and is provided with a second gear selection intermediate rocker arm, which is hinged to a gear selection connecting rod.

[0014] The synchronous movement of the first and second gear selection rocker arms is achieved through the intermediate pivot, which facilitates the transmission of the gear selection flexible shaft. The gear selection linkage and the gear selection flexible shaft are respectively arranged on both sides of the intermediate support, avoiding structural interference and ensuring high reliability.

[0015] Furthermore, the intermediate rocker arm assembly includes a sleeve movably sleeved on the intermediate rotating shaft. The outer periphery of the sleeve is provided with a first intermediate rocker arm and a second intermediate rocker arm. The first intermediate rocker arm is hinged to the shift flexible shaft, and the second intermediate rocker arm is hinged to the shift swing arm.

[0016] The sleeve is installed using the space on the intermediate rotating shaft, resulting in a compact structure and small footprint. The sleeve enables synchronous movement of the first and second intermediate rocker arms for gear shifting, ensuring high transmission reliability.

[0017] Furthermore, it also includes a guide bracket, through which both the lower part of the gear selection flexible shaft and the lower part of the gear shift flexible shaft pass.

[0018] It facilitates the constraint of the lower position of the gear selection and shifting flexible shafts, allowing the upper part of the gear selection and shifting flexible shafts to withstand bending, and ensuring good stability of the lower mechanism, thereby improving the reliability of gear selection and shifting.

[0019] Furthermore, the guide bracket is provided with a latch, the gear selection flexible shaft passes through one latch, and the gear shift flexible shaft passes through another latch.

[0020] It has a simple structure, low processing cost, and is easy to install.

[0021] Furthermore, all the latches are located on the same side of the guide bracket, and the guide bracket is also provided with a bending part that bends toward the other side of the guide bracket.

[0022] The bent part can be fixed to the frame of agricultural machinery, making installation convenient.

[0023] Furthermore, the shift lever mechanism includes a mounting base, a control shaft, and a shift lever. The middle part of the control shaft is ball-jointed to the mounting base, and the shift lever is connected to both ends of the control shaft. The control shaft is provided with a gear selection rocker arm and a shift rocker arm. The gear selection rocker arm is connected to the gear selection flexible shaft, and the shift rocker arm is connected to the shift flexible shaft.

[0024] It has a simple structure and low cost; the shift lever can drive the control shaft to swing left and right or rotate back and forth around its own hinge ball head, the gear selection rocker arm swings left and right with the control shaft, and the shift rocker arm swings back and forth with the control shaft, making it easy to control.

[0025] Furthermore, the control shaft is perpendicular to the gear selection flexible shaft, and the upper end of the gear selection rocker arm is rotatably connected to the control shaft; the upper end of the gear selection flexible shaft, the upper end of the gear shift flexible shaft, and the control shaft are all arranged horizontally.

[0026] The control shaft is arranged in the left-right direction. When the control shaft swings left and right, it can drive the gear selection rocker arm to swing, thereby pushing and pulling the gear selection flexible shaft along the axis to achieve gear selection. When the control shaft rotates back and forth, the control shaft rotates relative to the upper end of the gear selection rocker arm, and the gear selection rocker arm can remain stationary, avoiding the gear selection stability being affected during the gear shifting process.

[0027] Furthermore, the upper end of the gear selection flexible shaft is parallel to the upper end of the shift flexible shaft, and the upper end of the shift flexible shaft is ball-jointed to the shift rocker arm.

[0028] When the control shaft swings left and right, the shift rocker arm can move relative to the upper end of the shift flexible shaft through the ball joint, reducing the range of motion of the shift flexible shaft. Since the swing range of the control shaft is small, the ball joint further reduces the range of motion of the shift flexible shaft, thereby improving shifting stability and avoiding false triggering of shifting. The structure is simple and reduces manufacturing costs. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0030] Figure 2 This is a schematic diagram of the structure of this utility model viewed from the right.

[0031] Figure 3 This is a schematic diagram of the internal structure of the stop mechanism viewed from the right.

[0032] Figure 4 This is a schematic diagram of the internal structure of the stop mechanism viewed from the left.

[0033] In the accompanying drawings, the technical features represented by each reference numeral are as follows:

[0034] 1-Gear lever mechanism; 2-Transmission mechanism; 3-Gear selection flexible shaft; 4-Gear shifting flexible shaft; 5-Gear selection rocker arm; 6-Gear shifting rocker arm; 7-Intermediate bracket; 8-Gear selection linkage; 9-Gear shifting linkage; 10-Intermediate rotating shaft; 11-First gear selection intermediate rocker arm; 12-Second gear selection intermediate rocker arm; 13-Sleeve; 14-First gear shifting intermediate rocker arm; 15-Second gear shifting intermediate rocker arm; 16-Guide bracket; 17-Lock; 18-Bending part; 19-Mounting base; 20-Control shaft; 21-Gear shift lever; 22-Gear selection rocker arm; 23-Gear shifting rocker arm. Detailed Implementation

[0035] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0036] This utility model refers to Figure 1-4 .

[0037] This utility model provides a gear shifting control device for agricultural machinery, including a shift lever mechanism 1 and a gear shifting mechanism 2. The shift lever mechanism 1 is provided with a gear selection flexible shaft 3 and a gear shift flexible shaft 4, and the gear shifting mechanism 2 is provided with a gear selection swing arm 5 and a gear shift swing arm 6. The lower end of the gear selection flexible shaft 3 is drivenly connected to the gear selection swing arm 5, and when the gear selection flexible shaft 3 moves along its own axial direction, it can drive the gear selection swing arm 5 to swing. The lower end of the gear shift flexible shaft 4 is drivenly connected to the gear shift swing arm 6, and when the gear shift flexible shaft 4 moves along its own axial direction, it can drive the gear shift swing arm 6 to swing.

[0038] principle:

[0039] The shift lever mechanism 1 is equipped with a shift lever 21, a gear selection rocker arm 22, and a shift rocker arm 23. When the shift lever 21 swings left and right, it drives the gear selection rocker arm 22 to swing; when the shift lever 21 swings back and forth, it drives the shift rocker arm 23 to swing. The shift lever mechanism 1 is prior art, and its internal structure is unrelated to the technical problem solved by this utility model. The shift lever mechanism 1 may also have other names, such as: shifting and selection device, etc. When using the prior art shift lever mechanism 1, its conventional installation method is as follows: the gear selection rocker arm 22 is used to connect the gear selection transmission component (such as the gear selection linkage 8 mechanism in the prior art), and the shift rocker arm 23 is used to connect the shift transmission component (such as the shift linkage 9 mechanism in the prior art). Based on the limitation of this utility model that "the stop mechanism 1 is provided with a gear selection flexible shaft 3 and a gear shifting flexible shaft 4", when the stop mechanism 1 adopts the existing technical structure, those skilled in the art should be able to uniquely deduce that: the gear selection rocker arm 22 of the stop mechanism 1 is used to connect the gear selection flexible shaft 3, and the gear shifting rocker arm 23 is used to connect the gear shifting flexible shaft 4.

[0040] The transmission mechanism 2 is existing technology, and its internal structure is unrelated to the technical problem solved by this utility model. For ease of understanding, it is described as follows: Internally, it has a selection shaft and a shift shaft. The selection shaft is connected to the selection lever 5, and the shift shaft is connected to the shift lever 6. The selection shaft has a selection fork, and the shift shaft has a shift fork. When the selection shaft drives the selection fork to rotate, the selection fork can move the shift shaft or the shift fork along the axial direction of the shift shaft, causing the shift fork to move onto the synchronizer of a specific gear shaft, thus achieving gear selection. When the shift shaft drives the shift fork to rotate, the shift fork can move its synchronizer along the axial direction of the gear shaft, thus achieving gear shifting.

[0041] During installation, the gear shift mechanism 1 is located in the suspended cab of the agricultural machinery, and the transmission mechanism 2 is located on the shift gearbox. The lower end of the gear selection flexible shaft 3 can be directly connected to the gear selection swing arm 5, or it can be connected through an intermediate transmission such as a linkage mechanism; the lower end of the shift flexible shaft 4 can be directly connected to the shift swing arm 6, or it can be connected through an intermediate transmission such as a linkage mechanism. When the gear selection flexible shaft 3 moves along its own axis, it drives the gear selection swing arm 5 to swing, thus achieving gear selection; when the upper end of the gear selection flexible shaft 3 is subjected to a bending moment, due to its bending flexibility, the lower end of the gear selection flexible shaft 3 can remain basically stationary. When the shift flexible shaft 4 moves along its own axis, it drives the shift swing arm 6 to swing, thus achieving gear selection; when the upper end of the shift flexible shaft 4 is subjected to a bending moment, due to its bending flexibility, the lower end of the shift flexible shaft 4 can remain basically stationary.

[0042] In summary, by employing this utility model, when the shift lever 21 of the gear lever mechanism 1 is operated, the gear lever mechanism 1 drives the gear selection flexible shaft 3 and the shift flexible shaft 4 to move along their own axial direction. The gear selection flexible shaft 3 can drive the gear selection swing arm 5 to swing, and the shift flexible shaft 4 can drive the shift swing arm 6 to swing, thus realizing gear selection and shifting. When the gear lever mechanism 1 vibrates with the suspended cab, the bending flexibility of the gear selection flexible shaft 3 and the shift flexible shaft 4 cancels out the vibration, avoiding the transmission of vibration by the transmission components of the operating mechanism, reducing noise and failure rate, and improving operating comfort.

[0043] Furthermore, it also includes an intermediate support 7, on which a gear selection intermediate rocker arm assembly and a gear shift intermediate rocker arm assembly are provided. The lower end of the gear selection flexible shaft 3 is hinged to the gear selection intermediate rocker arm assembly, and a gear selection connecting rod 8 is hinged to the gear selection intermediate rocker arm assembly. The gear selection connecting rod 8 is hinged to the gear selection swing arm 5. The lower end of the gear shift flexible shaft 4 is hinged to the gear shift intermediate rocker arm assembly, and a gear shift connecting rod 9 is provided on the gear shift intermediate rocker arm assembly. The gear shift connecting rod 9 is hinged to the gear shift swing arm 6.

[0044] The intermediate bracket 7 can be installed on the frame of agricultural machinery, which increases the arrangement space at the lower end of the gear selection flexible shaft 3 and the gear shift flexible shaft 4, and improves the installation flexibility; at the same time, it avoids excessive bending of the gear selection flexible shaft 3 and the gear shift flexible shaft 4, which affects their axial transmission capacity, and has good reliability.

[0045] Furthermore, the gear selection intermediate rocker arm assembly includes an intermediate rotating shaft 10, one end of which is provided with a first gear selection intermediate rocker arm 11, which is hinged to the gear selection flexible shaft 3; the other end of the intermediate rotating shaft 10 passes through the intermediate bracket 7 and is provided with a second gear selection intermediate rocker arm 12, which is hinged to the gear selection connecting rod 8.

[0046] The intermediate pivot 10 enables the synchronous movement of the first gear selection intermediate rocker arm 11 and the second gear selection intermediate rocker arm 12, facilitating the transmission of the gear selection flexible shaft 3's movement; the gear selection linkage 8 and the gear selection flexible shaft 3 are respectively arranged on both sides of the intermediate support 7, avoiding structural interference and ensuring high reliability.

[0047] Furthermore, the intermediate rocker arm assembly includes a sleeve 13 movably sleeved on the intermediate rotating shaft 10. The outer periphery of the sleeve 13 is provided with a first intermediate rocker arm 14 and a second intermediate rocker arm 15. The first intermediate rocker arm 14 is hinged to the shift flexible shaft 4, and the second intermediate rocker arm 15 is hinged to the shift swing arm 6.

[0048] The sleeve 13 is installed using the space on the intermediate rotating shaft 10, which has a compact structure and occupies little space; the sleeve 13 realizes the synchronous movement of the first shift intermediate rocker arm 14 and the second shift intermediate rocker arm 15, and the transmission reliability is good.

[0049] Furthermore, it also includes a guide bracket 16, through which the lower part of the gear selection flexible shaft 3 and the lower part of the gear shift flexible shaft 4 both pass.

[0050] It facilitates the constraint of the lower position of the gear selection flexible shaft 3 and the gear shift flexible shaft 4, so that the upper part of the gear selection flexible shaft 3 and the gear shift flexible shaft 4 can withstand bending, the lower mechanism has good stability, and the reliability of gear selection and shifting is improved.

[0051] Furthermore, the guide bracket 16 is provided with a latch 17, the gear selection flexible shaft 3 passes through one latch 17, and the gear shift flexible shaft 4 passes through another latch 17.

[0052] It has a simple structure, low processing cost, and is easy to install.

[0053] Furthermore, all the latches 17 are located on the same side of the guide bracket 16, and the guide bracket 16 is also provided with a bending part 18, which bends to the other side of the guide bracket 16.

[0054] The bent part 18 can be fixed to the frame of agricultural machinery, making installation convenient.

[0055] Furthermore, the shift lever mechanism 1 includes a mounting base 19, a control shaft 20, and a shift lever 21. The middle part of the control shaft 20 is ball-jointed to the mounting base 19, and the shift lever 21 is connected to both ends of the control shaft 20. The control shaft 20 is provided with a gear selection rocker arm 22 and a shift rocker arm 23. The gear selection rocker arm 22 is connected to the gear selection flexible shaft 3, and the shift rocker arm 23 is connected to the shift flexible shaft 4.

[0056] The structure is simple and the cost is low. The shift lever 21 can drive the control shaft 20 to swing left and right or rotate back and forth around its own hinge ball head. The gear selection rocker arm 22 swings left and right with the control shaft 20, and the shift rocker arm 23 swings back and forth with the control shaft 20, which is convenient to control.

[0057] Furthermore, the control shaft 20 is perpendicular to the gear selection flexible shaft 3, and the upper end of the gear selection rocker arm 22 is rotatably connected to the control shaft 20; the upper end of the gear selection flexible shaft 3, the upper end of the gear shift flexible shaft 4, and the control shaft 20 are all arranged horizontally.

[0058] The control shaft 20 is arranged in the left and right direction. When the control shaft 20 swings left and right, it can drive the gear selection rocker arm 22 to swing, thereby pushing and pulling the gear selection flexible shaft 3 along the axis to achieve gear selection. When the control shaft 20 rotates back and forth, the control shaft 20 rotates relative to the upper end of the gear selection rocker arm 22, and the gear selection rocker arm 22 can remain stationary, avoiding the gear selection stability from being affected during the gear shifting process.

[0059] Furthermore, the upper end of the gear selection flexible shaft 3 is parallel to the upper end of the gear shift flexible shaft 4, and the upper end of the gear shift flexible shaft 4 is ball-jointed with the gear shift rocker arm 23.

[0060] When the control shaft 20 swings left and right, the shift rocker arm 23 can move relative to the upper end of the shift flexible shaft 4 through the ball joint, reducing the range of motion of the shift flexible shaft 4. Since the swing range of the control shaft 20 is small, the ball joint further reduces the range of motion of the shift flexible shaft 4, thereby improving shifting stability and avoiding false triggering of shifting. The structure is simple and reduces manufacturing costs.

[0061] In the description of this utility model, it should be understood that if descriptive terms indicating orientation, direction, or positional relationship appear, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of understanding this utility model and simplifying the description, and does not indicate or imply that the part, element, or whole referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0062] Furthermore, if sequential descriptive terms such as "first," "second," etc., appear, their purpose in this specification is for ease of understanding or simplification. For example, to distinguish multiple technical features of the same type or function, which must be mentioned separately, this specification may use prefixes or suffixes to differentiate them. Therefore, they should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first," "second," etc., may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0063] In this utility model, if descriptive terms describing structural relationships are used, such as "installation," "connection," "joining," and "fixing," they should be interpreted broadly unless otherwise explicitly specified and limited. For example, "installation," "connection," and "joining" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. "Fixing" can refer to an integral fixation or a detachable fixation using fasteners; it can be a direct fixation or a fixation through an intermediate medium. For those skilled in the art, the specific meaning of the above descriptive terms in this utility model can be understood based on the specific circumstances, the context, and the coherence of the preceding and following text.

[0064] In this utility model, if descriptive terms containing subordinate or connecting meanings appear, such as "above" or "below" the second feature, they should not be interpreted restrictively unless otherwise explicitly specified and limited. For example, "above" or "below" can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. For those skilled in the art, the specific meaning of the above descriptive terms in this utility model can be understood according to the specific circumstances, the context, and the coherence of the preceding and following text.

[0065] Furthermore, "above," "on top of," and "above" the first feature in relation to the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0066] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments, examples, and features described in this specification, and such combinations or integrations should all fall within the scope of the present invention.

[0067] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Variations, modifications, substitutions, and modifications made by those skilled in the art to the above embodiments within the scope of information available through public channels and in conjunction with the technical teachings given in this application are still covered within the protection scope of this application.

Claims

1. A transmission control device for agricultural machinery, characterized in that: The system includes a shift lever mechanism (1) and a transmission mechanism (2). The shift lever mechanism (1) is provided with a gear selection flexible shaft (3) and a shifting flexible shaft (4). The transmission mechanism (2) is provided with a gear selection swing arm (5) and a shifting swing arm (6). The lower end of the gear selection flexible shaft (3) is connected to the gear selection swing arm (5) in a transmission connection. When the gear selection flexible shaft (3) moves along its own axis, it can drive the gear selection swing arm (5) to swing. The lower end of the shifting flexible shaft (4) is connected to the shifting swing arm (6) in a transmission connection. When the shifting flexible shaft (4) moves along its own axis, it can drive the shifting swing arm (6) to swing. It also includes an intermediate support (7), on which a gear selection intermediate rocker arm group and a shifting intermediate rocker arm group are provided. The lower end of the gear selection flexible shaft (3) is hinged to the gear selection intermediate rocker arm group. A gear selection connecting rod (8) is hinged to the gear selection intermediate rocker arm group. The gear selection connecting rod (8) is hinged to the gear selection swing arm (5). The lower end of the shifting flexible shaft (4) is hinged to the shifting intermediate rocker arm group. A shifting connecting rod (9) is provided to the shifting intermediate rocker arm group. The shifting connecting rod (9) is hinged to the shifting swing arm (6).

2. The agricultural machinery transmission control device according to claim 1, characterized in that: The gear selection intermediate rocker arm assembly includes an intermediate rotating shaft (10), one end of which is provided with a first gear selection intermediate rocker arm (11), which is hinged to the gear selection flexible shaft (3); the other end of the intermediate rotating shaft (10) passes through the intermediate bracket (7) and is provided with a second gear selection intermediate rocker arm (12), which is hinged to the gear selection connecting rod (8).

3. The agricultural machinery transmission control device according to claim 2, characterized in that: The shifting intermediate rocker arm assembly includes a sleeve (13) movably sleeved on the intermediate rotating shaft (10). The outer periphery of the sleeve (13) is provided with a first shifting intermediate rocker arm (14) and a second shifting intermediate rocker arm (15). The first shifting intermediate rocker arm (14) is hinged to the shifting flexible shaft (4), and the second shifting intermediate rocker arm (15) is hinged to the shifting swing arm (6).

4. The agricultural machinery transmission control device according to claim 1, characterized in that: It also includes a guide bracket (16), through which the lower part of the gear selection flexible shaft (3) and the lower part of the gear shift flexible shaft (4) pass.

5. The agricultural machinery transmission control device according to claim 4, characterized in that: The guide bracket (16) is provided with a latch (17), the gear selection flexible shaft (3) passes through one latch (17), and the gear shift flexible shaft (4) passes through another latch (17).

6. The agricultural machinery transmission control device according to claim 5, characterized in that: The latches (17) are all located on the same side of the guide bracket (16), and the guide bracket (16) is also provided with a bending part (18), which bends to the other side of the guide bracket (16).

7. The agricultural machinery transmission control device according to claim 1, characterized in that: The shift lever mechanism (1) includes a mounting base (19), an operating shaft (20) and a shift lever (21). The middle part of the operating shaft (20) is ball-jointed to the mounting base (19), and the shift lever (21) is connected to both ends of the operating shaft (20). The operating shaft (20) is provided with a gear selection rocker arm (22) and a shift rocker arm (23). The gear selection rocker arm (22) is connected to the gear selection flexible shaft (3), and the shift rocker arm (23) is connected to the shift flexible shaft (4).

8. The agricultural machinery transmission control device according to claim 7, characterized in that: The control shaft (20) is perpendicular to the gear selection soft shaft (3), and the upper end of the gear selection rocker arm (22) is rotatably connected to the control shaft (20); the upper end of the gear selection soft shaft (3), the upper end of the gear shifting soft shaft (4) and the control shaft (20) are all arranged horizontally.

9. The agricultural machinery transmission control device according to claim 8, characterized in that: The upper end of the gear selection flexible shaft (3) is parallel to the upper end of the shift flexible shaft (4), and the upper end of the shift flexible shaft (4) and the shift rocker arm (23) are connected by a ball joint.

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