Mechanical auxiliary speed change control system and tractor with same

Abstract

The invention relates to a mechanical pair variable-speed control system and a tractor with the same, and belongs to the technical field of variable-speed transmission. The control system comprises a first shifting fork shaft, a second shifting fork shaft, a gear shifting fork, a gear selecting fork, a gear shifting connecting rod and a gear selecting connecting shaft, the first shifting fork shaft and the second shifting fork shaft are distributed in an up-down parallel and spaced mode, the gear shifting fork and the gear selecting fork are distributed in a left-right spaced mode, one end of the gear shifting fork is assembled with the second shifting fork shaft, the gear selecting fork is assembled with the first shifting fork shaft, and the gear shifting connecting rod extends front and back. The front end of the gear selecting connecting shaft is connected with one end of the gear shifting fork and one end of the gear selecting fork through a first connecting piece, one end of the gear selecting connecting shaft is movably connected with the rear end of the gear shifting connecting rod through a second connecting piece, a first driving piece is arranged at the rear end of the gear shifting connecting rod, and a second driving piece is arranged at the other end of the gear selecting connecting shaft. The gear selecting and shifting mechanism has the advantages that the number of gears of a tractor is increased, the transmission ratio range is expanded, the adaptability and economical efficiency of a vehicle are improved, and the gear selecting and shifting mechanism is flexible in operation, stable in gear shifting and the like through separation of gear selecting parts and gear shifting parts.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural machinery speed change transmission, and in particular to a mechanical auxiliary speed change control system and a tractor having the same. Background Art

[0002] At present, the gear selection and shifting of large tractors are generally modular in design. In most designs, gear selection and shifting are concentrated on one gear shift shaft. When shifting gears, the force is large, so the transmission performance is relatively poor. In addition, the entire gear selection and shifting design requires a large layout space, which makes the vehicle structure not compact and the volume is invisibly designed to be larger, reducing the appearance of the vehicle.

[0003] Based on this, it is necessary to develop a mechanical auxiliary speed change control system and a tractor having the same to overcome the above technical problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a mechanical auxiliary speed change control system and a tractor having the same, which effectively overcomes the defects of the prior art.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: A mechanical auxiliary transmission control system comprises a first shift fork shaft, a second shift fork shaft, a shift fork, a shift selection fork, a shift connecting rod and a shift selection connecting shaft, wherein the first shift fork shaft and the second shift fork shaft extend left and right and are arranged parallel to each other up and down, the shift fork and the shift selection fork are arranged left and right and are arranged in front of the first shift fork shaft, one end of the shift fork is assembled with the second shift fork shaft, the shift selection fork is assembled with the first shift fork shaft, the shift connecting rod extends forward and backward, and its front end is connected to one end of the shift fork and the shift selection fork respectively through a first connecting member, the shift selection connecting shaft extends left and right and is provided with The gear selector shaft is placed above the rear end of the gear shift link, one end of the gear selector shaft is movably connected to the rear end of the gear shift link through a second connecting piece, the rear end of the gear shift link is provided with a first driving piece for driving the gear selector shaft to rotate, and the other end of the gear selector shaft is provided with a second driving piece for driving the gear selector shaft to rotate. When the gear selector shaft rotates, the gear shift link is driven to move forward and backward through the second connecting piece, thereby driving the gear shift fork and the fork shaft 1 to rotate. When the gear shift link rotates, the gear shift fork, the gear selector fork, the fork shaft 1 and the fork shaft 2 are driven to move left and right synchronously through the first connecting piece.

[0006] Based on the above technical solution, the present invention can also be improved as follows.

[0007] Furthermore, a first connecting seat is provided at one end of the shift fork, and first through holes distributed up and down are provided in the first connecting seat. The fork shaft 1 and the fork shaft 2 correspond to the first through holes passing through the upper and lower parts respectively, and the first connecting seat is assembled with the fork shaft 2 through a first locking member.

[0008] Furthermore, the first locking member is a set screw, which is screwed onto the first connecting seat and extends into the first through hole below and abuts against two surfaces of the fork shaft.

[0009] Furthermore, a second connecting seat is provided at one end of the above-mentioned shift fork, and second through holes distributed up and down are provided in the above-mentioned second connecting seat. The above-mentioned fork shaft 1 and fork shaft 2 correspond to the second through holes passing through the upper and lower parts respectively, and the above-mentioned second connecting seat is assembled with the above-mentioned fork shaft 1 through a second locking piece.

[0010] Furthermore, the second locking member is a set screw, which is screwed onto the second connecting seat, extends into the second through hole above, and abuts against a surface of the shift fork shaft.

[0011] Furthermore, one end of the above-mentioned shift fork is provided with a first sleeve which is sleeved on the above-mentioned fork shaft 2, the above-mentioned first sleeve extends toward the above-mentioned shift fork, and a first limit block extending downward is provided at the end thereof, and one end of the above-mentioned shift fork is provided with a second sleeve which is sleeved on the above-mentioned fork shaft 1, the above-mentioned second sleeve extends toward the above-mentioned shift fork, and a second limit block extending downward is provided at the end thereof, the above-mentioned second limit block is located at the rear side of the above-mentioned first limit block, and notch grooves are respectively provided on the surfaces of the second limit block and the first limit block which are close to each other, the two notch grooves together enclose a limit groove, and the end of the above-mentioned first connecting member is embedded in the above-mentioned limit groove.

[0012] Furthermore, a circular arc-shaped fitting groove is coaxially provided on the upper surface of the rear end of the shift connecting rod, and the end of the second connecting member is embedded in the fitting groove.

[0013] Furthermore, the first driving member includes a first rocker arm vertically arranged on one side of the rear end of the shift connecting rod, and a first connecting hole is opened at one end of the first rocker arm away from the shift connecting rod, and the second driving member includes a second rocker arm vertically arranged on the other end of the shift connecting shaft, and a second connecting hole is opened at one end of the second rocker arm away from the shift connecting shaft.

[0014] Furthermore, it also includes a shell seat, the front side of the shell seat is open, and the edge of the open side is provided with a mounting side plate, the shift connecting rod passes through the rear side of the shell seat, and can move forward and backward and rotate relative to the shell seat, the shift connecting shaft is rotatably assembled on one side wall of the shell seat, and the other end extends out of the shell seat, and the second connecting member is located in the shell seat.

[0015] The beneficial effects are: reasonable structural design, increased number of gears through separation of gear selection and shifting components, expanded transmission ratio range, improved vehicle adaptability and economy, and advantages of flexible operation and smooth shifting, etc.

[0016] A tractor is also provided, comprising a mechanical auxiliary speed change control system.

[0017] The beneficial effects are: improving driving comfort and safety, and meeting the driving needs of the tractor under different road conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the mechanical auxiliary speed change control system of the present invention; Figure 2 The mechanical auxiliary speed change control system of the present invention is provided with a housing seat. Figure 1 ; Figure 3 The mechanical auxiliary speed change control system of the present invention is provided with a housing seat. Figure 2 .

[0019] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Shift fork shaft 1; 2. Shift fork shaft 2; 3. Shift fork; 4. Shift fork; 5. Shift connecting rod; 6. Shift connecting shaft; 7. First connecting member; 8. Second connecting member; 9. Shell seat; 31. First sleeve; 32. First limit block; 41. Second sleeve; 42. Second limit block; 51. First driving member; 61. Second driving member. DETAILED DESCRIPTION

[0020] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0021] Example 1 like Figure 1 , 23, the mechanical auxiliary speed change control system of this embodiment includes a fork shaft 1, a fork shaft 2, a shift fork 3, a selector fork 4, a shift connecting rod 5 and a selector connecting shaft 6. The fork shaft 1 and the fork shaft 2 extend left and right and are arranged parallel to each other up and down. The shift fork 3 and the selector fork 4 are arranged left and right and are respectively located in front of the fork shaft 1. One end of the shift fork 3 is assembled with the fork shaft 2, and the selector fork 4 is assembled with the fork shaft 1. The shift connecting rod 5 extends forward and backward, and its front end is connected to one end of the shift fork 3 and the selector fork 4 respectively through a first connecting member 7. The selector connecting shaft 6 extends left and right. , and is arranged above the rear end of the above-mentioned shift connecting rod 5, one end of the above-mentioned shift selecting connecting shaft 6 is movably connected with the rear end of the above-mentioned shift connecting rod 5 through the second connecting member 8, the rear end of the above-mentioned shift connecting rod 5 is provided with a first driving member 51 for driving its rotation, and the other end of the above-mentioned shift selecting connecting shaft 6 is provided with a second driving member 61 for driving its rotation. When the above-mentioned shift connecting shaft 6 rotates, the above-mentioned shift connecting rod 5 is driven to move forward and backward through the above-mentioned second connecting member 8, thereby driving the above-mentioned shift fork 3 and the shift fork shaft 1 to rotate. When the above-mentioned shift connecting rod 5 rotates, the above-mentioned shift fork 3, the shift selecting fork 4, the shift fork shaft 1 and the shift fork shaft 2 are driven to move left and right synchronously through the above-mentioned first connecting member 7.

[0022] The operation process of the mechanical auxiliary speed change control system of this embodiment is as follows: When in use, when the vehicle does not need to increase the gear, the first driving member 51 and the second driving member 61 are both in the neutral position (empty position) of selecting or shifting gears. When selecting and shifting gears are required, the specific operation is as follows: when shifting to the C gear, it is only necessary to operate the first driving member 51 to move downward, thereby driving the shift connecting rod 5 to rotate leftward (that is, counterclockwise), and the first connecting member 7 at the front end of the shift connecting rod 5 will drive the shift fork 3 and the shift selection fork 4 to move leftward; when shifting to the B gear, it is necessary to operate the first driving member 51 to return upward to the neutral position, and then continue to operate the first driving member 51 to move upward, thereby driving the shift connecting rod 5 to rotate rightward (that is, clockwise), and the first connecting member 7 at the front end of the shift connecting rod 5 will drive the shift fork 3 and the shift selection fork 4 to move rightward, that is, reaching the B gear.

[0023] When it is necessary to shift to AD gear, it is necessary to first operate the second driving member 61 to move downward back to the middle position, and then operate the second driving member 61 to continue to move downward, thereby driving the gear selection connecting shaft 6 to rotate (clockwise rotation), and the second connecting member 8 at one end of the gear selection connecting shaft 6 will swing forward, thereby pushing the shift connecting rod 5 connected thereto to move forward (the gear selection fork 4 does not rotate), that is, reaching the A gear; when it is necessary to shift to the D gear, first operate the second driving member 61 to move upward back to the middle position, and then continue to operate the second driving member 61 to move upward, thereby driving the gear selection connecting shaft 6 to rotate (counterclockwise rotation), and the second connecting member 8 at one end of the gear selection connecting shaft 6 will swing backward, thereby pushing the shift connecting rod 5 connected thereto to move backward. While moving, the second connecting member 8 will push the gear selection fork 4 to rotate (counterclockwise rotation), that is, reaching the D gear. That is to say, the second driving member 61 drives the gear selection shaft 6 to select the correct gear, and drives the second connecting member 8 to swing back and forth, which is the process of switching from BC gear to AD gear; the first driving member 51 drives the shift connecting rod 5 to rotate, and drives the first connecting member 7 to swing left and right, which is the process of switching from B to C gear or AD gear.

[0024] On the whole, the structural design is reasonable. By separating the gear selection and shifting components, the number of gears is increased, the transmission ratio range is expanded, the adaptability and economy of the vehicle are improved, and it has the advantages of flexible operation and smooth shifting.

[0025] In this embodiment, a first connecting seat is provided at one end of the shift fork 3, and first through holes are provided in the first connecting seat, and the fork shaft 1 and the fork shaft 2 correspond to the first through holes passing through the upper and lower parts respectively, and the first connecting seat is assembled with the fork shaft 2 2 through a first locking member. The shift fork 3 and the fork shaft 1 and the fork shaft 2 are respectively designed with a plug-in sleeve structure, and the structures are compactly matched and have good linkage.

[0026] In this embodiment, the first locking member is a set screw, which is screwed onto the first connecting seat and extends into the first through hole below and abuts against the surface of the fork shaft 2. The first locking member is a set screw, which is convenient and quick to disassemble and assemble.

[0027] In this embodiment, a first boss is provided on the outer side of the first connecting seat, and one or more screw holes adapted to the first locking member are opened on the first boss. The first locking member (fastening screw) is screwed into the screw hole and passes through the side wall of the first through hole to abut against the surface of the fork shaft 2, thereby realizing the assembly of the first connecting seat and the fork shaft 2, and the disassembly is very simple and quick.

[0028] In this embodiment, a second connection seat is provided at one end of the shift fork 4, and second through holes are provided in the second connection seat, and the shift fork shaft 1 and the shift fork shaft 2 correspond to the second through holes passing through the upper and lower parts, respectively, and the second connection seat is assembled with the shift fork shaft 1 through a second locking member. The shift fork 4 and the shift fork shaft 1 and the shift fork shaft 2 are respectively designed with a plug-in structure, and the structures are compactly matched and have good linkage.

[0029] In this embodiment, a second boss is provided on the outer side of the first connecting seat, and one or more screw holes adapted to the second locking member are opened on the second boss. The second locking member (setting screw) is screwed into the screw hole and passes through the side wall of the second through hole to abut against the surface of the fork shaft 1, thereby realizing the assembly of the second connecting seat and the fork shaft 1, and the disassembly is very simple and quick.

[0030] In this embodiment, the second locking member is a set screw, which is screwed onto the second connection seat and extends into the second through hole above and abuts against the surface of the fork shaft 1. The second locking member is a set screw, which is convenient and quick to disassemble and assemble.

[0031] As a preferred embodiment, one end of the above-mentioned shift fork 3 is provided with a first sleeve 31 which is sleeved on the above-mentioned fork shaft 2, the above-mentioned first sleeve 31 extends toward the above-mentioned shift fork 4, and a first limit block 32 extending downward is provided at the end thereof, and one end of the above-mentioned shift fork 4 is provided with a second sleeve 41 which is sleeved on the above-mentioned fork shaft 1, the above-mentioned second sleeve 41 extends toward the above-mentioned shift fork 3, and a second limit block 42 extending downward is provided at the end thereof, the above-mentioned second limit block 42 is located at the rear side of the above-mentioned first limit block 32, and notch grooves are respectively provided on the surfaces of the second limit block 42 and the first limit block 32 which are close to each other, and the two notch grooves together enclose a limit groove (denoted by D in the figure), and the end of the above-mentioned first connecting member 7 is embedded in the above-mentioned limit groove.

[0032] In the above embodiment, the width of the end of the first connecting member 7 is close to the width of the limit groove formed by the two notch grooves. When in the middle position, the end of the first connecting member 7 is in the middle area of ​​the limit groove in the front-to-back direction. When the gear is shifted to A, the end of the first connecting member 7 just moves to the front end of the limit groove. When the gear is shifted to D, the end of the first connecting member 7 will push the second limit block 42 to flip upward, and the second limit block 42 can drive the second sleeve 41, the shift fork 4 and the shift fork shaft 1 to rotate counterclockwise. After rotating in place, the gear is switched to D. This design is very clever, and can take into account the synchronous left-right movement of the shift fork 3 and the shift fork 4 when shifting to BC, and the rotation of the shift fork 4 relative to the shift fork 3 when shifting to AD.

[0033] In this embodiment, the first connecting member 7 includes a first circular sleeve portion fixed to the front end of the shift link 5, the upper portion of the first circular sleeve portion is integrally provided with a first extension portion with a gradually narrowing width, and the end of the first extension portion is provided with a first shift block embedded in the limiting groove.

[0034] In this embodiment, the first sleeve 31 is integrally formed with one end of the shift fork 3, and the cavity in the first sleeve 31 is connected to the corresponding first through hole. The second sleeve 41 is integrally formed with one end of the shift fork 4, and the cavity in the second sleeve 41 is connected to the corresponding second through hole.

[0035] As a preferred embodiment, a circular arc-shaped fitting groove (denoted by M in the figure) is coaxially provided on the upper surface of the rear end of the shift connecting rod 5, and the end of the second connecting member 8 is embedded in the fitting groove.

[0036] In the above embodiment, when the first driving member 51 is in the middle position, the end of the second connecting member 8 is in the middle area of ​​the fitting groove, and when the first driving member 51 is in the BC gear switching process, as the shift fork 3 rotates, the end of the first driving member 51 moves relatively between the two ends of the fitting groove, wherein the width of the fitting groove is close to the width of the end of the second connecting member 8. This design meets the displacement requirement of the second connecting member 8 relative to the shift connecting rod 5 during gear shifting.

[0037] In this embodiment, the second connecting member 8 includes a second circular sleeve portion fixed to one end of the gear selection connecting shaft 6, a second extension portion with a gradually narrowing width is integrally provided at the lower part of the second circular sleeve portion, and a second shifting block embedded in the fitting groove is provided at the end of the second extension portion. The second connecting member 8 has a reasonable shape design and closely cooperates with the fitting groove, so as to realize flexible and effective gear selection operation.

[0038] In this embodiment, the first driving member 51 includes a first rocker arm vertically arranged at one side of the rear end of the shift link 5, and a first connecting hole is formed at one end of the first rocker arm away from the shift link 5. The second driving member 61 includes a second rocker arm vertically arranged at the other end of the shift select shaft 6, and a second connecting hole is formed at one end of the second rocker arm away from the shift select shaft 6. The first rocker arm and the second rocker arm are reasonably arranged in position, and the corresponding flexible shafts are connected through the first connecting hole and the second connecting hole respectively. The first rocker arm and the second rocker arm can be rotated by pulling the flexible shaft, thereby realizing the rotation of the shift link 5 and the shift select shaft 6, and realizing the switching of the gear position.

[0039] It should be particularly noted that: when the first rocker arm is located on one side of the central axis of the shift connecting rod 5, it is in the middle position. When the second rocker arm is in the middle position, the first rocker arm rotates downward relative to the middle position to reach the C gear, and moves upward relative to the middle position to reach the B gear. When the second rocker arm swings backward, and drives the shift fork 4 to rotate downward through the first connecting member 7 to switch to the AD gear, the first rocker arm then moves downward (swings) from the middle position to reach the A gear, and the first rocker arm moves upward (swings) from the middle position to reach the D gear.

[0040] As a preferred embodiment, Figure 2 , 3 As shown, it also includes a shell seat 9, the front side of the shell seat 9 is open, and the edge of the open side is provided with a mounting side plate, the shift connecting rod 5 passes through the rear side of the shell seat 9, and can move forward and backward and rotate relative to the shell seat 9, the shift connecting shaft 6 is rotatably assembled on one side wall of the shell seat 9, and the other end extends into the outside of the shell seat 9, and the second connecting member 8 is located in the shell seat 9.

[0041] In the above embodiment, the design of the housing seat 9 facilitates the assembly of the shift connecting rod 5 and the gear selection connecting shaft 6, and the operation is more reasonable and convenient. The mounting side plate at the edge of the housing seat 9 is assembled with the corresponding carrier (vehicle) through a plurality of bolts passing through it.

[0042] Example 2 The tractor of this embodiment includes the mechanical auxiliary speed change control system of embodiment 1.

[0043] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0045] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be 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 be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may 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. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0047] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0048] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A mechanical auxiliary speed change control system, characterized in that: The invention comprises a shift fork shaft 1 (1), a shift fork shaft 2 (2), a shift fork (3), a gear selection fork (4), a shift connecting rod (5) and a gear selection connecting shaft (6), wherein the shift fork shaft 1 (1) and the shift fork shaft 2 (2) extend left and right and are arranged in parallel and spaced apart from each other in the upper and lower directions, the shift fork (3) and the gear selection fork (4) are arranged left and right and spaced apart from each other and are respectively located in front of the shift fork shaft 1 (1), one end of the shift fork (3) is assembled with the shift fork shaft 2 (2), and the gear selection fork (4) is assembled with the shift fork shaft 1 (1), the shift connecting rod (5) extends forward and backward, and its front end is respectively connected to one end of the shift fork (3) and the gear selection fork (4) through a first connecting member (7), and the gear selection connecting shaft (6) extends left and right and is arranged on the shift fork shaft 1 (1). Above the rear end of the connecting rod (5), one end of the gear selection connecting shaft (6) is movably connected to the rear end of the gear shift connecting rod (5) through a second connecting member (8); the rear end of the gear shift connecting rod (5) is provided with a first driving member (51) for driving the gear shift connecting rod (5) to rotate; the other end of the gear selection connecting shaft (6) is provided with a second driving member (61) for driving the gear shift connecting rod (5) to rotate; when the gear selection connecting shaft (6) rotates, the gear shift connecting rod (5) is driven to move forward and backward through the second connecting member (8), thereby driving the gear shift fork (3) and the gear shift fork shaft 1 (1) to rotate; when the gear shift connecting rod (5) rotates, the gear shift fork (3), the gear selection fork (4), the gear shift fork shaft 1 (1) and the gear shift fork shaft 2 (2) are driven to move left and right synchronously through the first connecting member (7).

2. A mechanical auxiliary transmission control system according to claim 1, characterized in that: A first connecting seat is provided at one end of the shift fork (3), and first through holes are provided in the first connecting seat, and the shift fork shaft 1 (1) and the shift fork shaft 2 (2) respectively correspond to the first through holes passing through the upper and lower parts, and the first connecting seat is assembled with the shift fork shaft 2 (2) via a first locking member.

3. A mechanical auxiliary speed change control system according to claim 2, characterized in that: The first locking member is a set screw, which is screwed onto the first connecting seat and extends into the first through hole below and abuts against the second surface of the fork shaft (2).

4. A mechanical auxiliary transmission control system according to claim 1, characterized in that: A second connecting seat is provided at one end of the shift fork (4), and second through holes are provided in the second connecting seat, and the shift fork shaft 1 (1) and the shift fork shaft 2 (2) respectively correspond to the second through holes passing through the upper and lower parts, and the second connecting seat is assembled with the shift fork shaft 1 (1) via a second locking member.

5. A mechanical auxiliary transmission control system according to claim 4, characterized in that: The second locking member is a set screw, which is screwed onto the second connecting seat and extends into the second through hole above and abuts against a surface of the shift fork shaft (1).

6. A mechanical auxiliary transmission control system according to claim 1, characterized in that: One end of the shift fork (3) is provided with a first sleeve (31) sleeved on the second shift fork shaft (2), the first sleeve (31) extends toward the shift fork (4), and the end portion is provided with a first limit block (32) extending downwards, one end of the shift fork (4) is provided with a second sleeve (41) sleeved on the first shift fork shaft (1), the second sleeve (41) extends toward the shift fork (3), and the end portion is provided with a second limit block (42) extending downwards, the second limit block (42) is located at the rear side of the first limit block (32), and the second limit block (42) and the first limit block (32) are respectively provided with notch grooves on a surface close to each other, the two notch grooves are enclosed together to form a limit groove, and the end portion of the first connecting member (7) is embedded in the limit groove.

7. A mechanical auxiliary transmission control system according to claim 1, characterized in that: An arc-shaped engaging groove is coaxially provided on the upper surface of the rear end of the shift connecting rod (5), and the end of the second connecting member (8) is embedded in the engaging groove.

8. The mechanical auxiliary transmission control system according to claim 1, characterized in that: The first driving member (51) comprises a first rocker arm vertically arranged at one side of the rear end of the shift connecting rod (5), and a first connecting hole is formed at one end of the first rocker arm away from the shift connecting rod (5). The second driving member (61) comprises a second rocker arm vertically arranged at the other end of the shift connecting shaft (6), and a second connecting hole is formed at one end of the second rocker arm away from the shift connecting shaft (6).

9. A mechanical auxiliary transmission control system according to any one of claims 1 to 8, characterized in that: It also includes a housing seat (9), the front side of the housing seat (9) is open, and the edge of the open side is provided with a mounting side plate, the shift connecting rod (5) passes through the rear side of the housing seat (9), and can move forward and backward and rotate relative to the housing seat (9), the shift connecting shaft (6) is rotatably assembled on a side wall of one side of the housing seat (9), and the other end extends into the outside of the housing seat (9), and the second connecting member (8) is located in the housing seat (9).

10. A tractor, characterized in that: It comprises a mechanical auxiliary transmission control system as described in any one of claims 1 to 9.

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