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 vertically and parallelly distributed at intervals, the gear shifting fork and the gear selecting fork are horizontally distributed at intervals, the rear 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 the rear end of the gear shifting fork and the rear 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 speed change control system includes a first shift fork shaft, a second shift fork shaft, a shift fork, a select shift fork, a shift connecting rod and a select shift connecting rod, wherein the first shift fork shaft and the second shift fork shaft extend left and right and are arranged parallel to each other in an upper and lower manner; the shift fork and the select shift fork are arranged left and right and are both located in front of the first shift fork shaft, the rear end of the shift fork is assembled with the second shift fork shaft, and the rear end of the select shift fork is assembled with the first shift fork shaft; the shift connecting rod extends forward and backward, and its front end is movably connected to the rear ends of the shift fork and the select shift fork respectively through a first connecting member, and the rear end of the shift connecting rod A first driving member is provided for driving it to rotate; the shift select shaft extends left and right and is located above the rear end of the shift link, one end of the shift shaft is movably connected to the rear end of the shift link through a second connecting member, and the other end of the shift shaft is provided with a second driving member for driving it to rotate; when the shift select shaft rotates, the shift link is moved forward and backward through the second connecting member, and the shift link drives the first connecting member to enter the shift fork or the shift fork, and when the shift link rotates, the shift fork or the shift fork is driven to move left and right through the first connecting member.

[0006] On the basis of the above technical solution, the present invention can also be improved as follows.

[0007] Furthermore, a first connecting seat is provided at the rear end of the shift fork, and first through holes distributed upper and lower are provided in the first connecting seat. The fork shaft one and the fork shaft two respectively pass through the two first through holes upper and lower. The first connecting seat is assembled with the fork shaft two through a first locking piece.

[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 shift select fork, and second through holes distributed upper and lower are provided in the second connecting seat. The shift fork shaft 1 and the shift fork shaft 2 respectively pass through the two second through holes upper and lower. The second connecting seat is assembled with the shift 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, the rear end of the shift fork is provided with a first sleeve mounted on the second shift fork shaft, the first sleeve extends toward the shift fork, and a first limit block extending downward is provided at the end thereof, the rear end of the shift fork is provided with a second sleeve mounted on the first shift fork shaft, the second sleeve extends toward the shift fork, and a second limit block extending downward is provided at the end thereof, the second limit block is located on the rear side of the first limit block, and notch grooves are respectively provided on the sides of the second limit block and the first limit block that are close to each other, the two notch grooves together enclose a limit groove, and the end of the first connecting member extends into the 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 link, and a first connecting hole is opened at the end of the first rocker arm away from the shift link; the second driving member includes a second rocker arm vertically arranged at the other end of the shift connecting shaft, and a second connecting hole is opened at the end of the second rocker arm away from the shift connecting shaft.

[0014] Furthermore, it also includes a shell base, the front side of the shell base 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 base, and can move forward and backward and rotate relative to the shell base, and the shift connecting shaft is rotatably assembled on one side wall of the shell base, one end of which and the second connecting member are located in the shell base, and the other end of which extends out of the shell base.

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

[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 tractors 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.

[0019] Figure 2 The mechanical auxiliary speed change control system of the present invention is equipped with a housing structure diagram Figure 1 .

[0020] Figure 3 The mechanical auxiliary speed change control system of the present invention is equipped with a housing structure diagram Figure 2 .

[0021] In the accompanying drawings, the technical features represented by the reference numerals are as follows: 1-Shift fork shaft 1; 2-Shift fork shaft 2; 3-Shift fork; 4-Shift select fork; 5-Shift connecting rod; 6-Shift select connecting shaft; 7-First connecting member; 8-Second connecting member; 9-Casing seat; 31 - first sleeve; 32 - first limiting block; 41 - second sleeve; 42 - second limiting block; 51 - first driving member; 61 - second driving member. DETAILED DESCRIPTION

[0022] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0023] Example 1 like Figure 1 、 23, the mechanical auxiliary speed change control system of this embodiment includes a shift fork shaft 1, a shift fork shaft 2, a shift fork 3, a selector fork 4, a shift connecting rod 5 and a selector connecting shaft 6. The shift fork shaft 1 and the shift fork shaft 2 extend left and right and are arranged parallel to each other in an upper and lower direction; the shift fork 3 and the selector fork 4 are arranged left and right and are both located in front of the shift fork shaft 1, the rear end of the shift fork 3 is assembled with the shift fork shaft 2, and the rear end of the selector fork 4 is assembled with the shift fork shaft 1; the shift connecting rod 5 extends forward and backward, and its front end is movably connected to the rear ends of the shift fork 3 and the selector fork 4 respectively through a first connecting member 7. The rear end of the gear selection connecting shaft 6 is provided with a first driving member 51 for driving it to rotate; the gear selection connecting shaft 6 extends left and right and is located above the rear end of the gear shift 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, and the other end of the gear selection connecting shaft 6 is provided with a second driving member 61 for driving it to rotate; when the gear selection connecting shaft 6 rotates, the gear shift connecting rod 5 is moved forward and backward through the second connecting member 8, and the gear shift connecting rod 5 drives the first connecting member 7 to enter the gear shift fork 3 or the gear selection fork 4. When the gear shift connecting shaft 5 rotates, the gear shift fork 3 or the gear selection fork 4 is driven to move left and right through the first connecting member 7.

[0024] The operation process of the mechanical auxiliary transmission control system of this embodiment is as follows: When the vehicle does not need to enter a gear, the end of the first connecting member 7 initially enters the shift fork 3, and the first driving member 51 and the second driving member 61 are both in the neutral position (neutral position) of the shift fork 3. When gear selection and shifting are required, the specific operation is as follows: To shift to BC, the first driving member 51 needs only to be rotated downward, thereby driving the shift link 5 to rotate leftward. The first connecting member 7 at the front end of the shift link 5 will drive the shift fork 3 to move leftward, thus reaching C. To shift to B, the first driving member 51 needs to be returned upward to the neutral position. The first driving member 51 is then further rotated upward, thereby driving the shift link 5 to rotate rightward. The first connecting member 7 at the front end of the shift link 5 will drive the shift fork 3 to move rightward, thus reaching B.

[0025] To shift to A / D, first rotate the second drive member 61 upward, thereby rotating the select coupling 6. The second connecting member 8 at one end of the select coupling 6 swings backward, pushing the connected shift link 5 backward. The end of the first connecting member 7 at the front end of the shift link 5 leaves the shift fork 3 and enters the select fork 4. Then, simply rotate the first drive member 51 downward, rotating the shift link 5 to the left. The first connecting member 7 at the front end of the shift link 5 moves the select fork 4 to the left, thus shifting to A gear. To shift to D gear, the first drive member 51 is returned upward to its neutral position. Then, continue rotating the first drive member 51 upward, rotating the shift link 5 to the right. The first connecting member 7 at the front end of the shift link 5 moves the select fork 4 to the right, thus shifting to D gear.

[0026] That is to say, the second driving member 61 drives the gear selection connecting shaft 6 to select gear, and drives the second connecting member 8 to swing back and forth, which is the gear selection process 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.

[0027] On the whole, the structural design is reasonable. The gear selection is carried out by driving the shift connecting rod 5 through the gear selection shaft 6. The shift connecting rod 5 drives the shift fork 3 or the gear selection fork 4 to shift gears. The gear selection and shifting components are separated. Only one first connecting member 7 is needed to respectively shift the shift fork 3 or the gear selection fork 4 to switch four gears, which increases the number of gears, expands the transmission ratio range, improves the adaptability and economy of the vehicle, and has the advantages of flexible operation and smooth shifting.

[0028] In this embodiment, the rear end of the shift fork 3 is provided with a first connecting seat. The first connecting seat has upper and lower first through-holes disposed therein. The shift fork shaft 1 and the shift fork shaft 2 extend through the upper and lower first through-holes, respectively. The first connecting seat is assembled with the shift fork shaft 2 via a first locking member. The first through-hole of the shift fork shaft 1 guides the first connecting seat, ensuring stable sliding operation of the shift fork 3. The shift fork 3, the shift fork shaft 1, and the shift fork shaft 2, respectively, employ a socket-and-socket design, resulting in a compact fit and good linkage.

[0029] In this embodiment, the first locking member is a set screw that is screwed onto the first connecting seat and extends into the first through hole below and abuts against the surface of the shift fork shaft 2. The use of a set screw for the first locking member allows for easy and quick assembly and disassembly.

[0030] 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, and abuts against the surface of the fork shaft 2, thereby realizing the assembly of the first connecting seat and the fork shaft 2. The assembly and disassembly are very simple and quick.

[0031] In this embodiment, a second connecting seat is provided at one end of the shift fork 4. The second connecting seat has upper and lower second through-holes disposed therein. The shift fork shaft 1 and the shift fork shaft 2 extend through the upper and lower second through-holes, respectively. The second connecting seat is assembled to the shift fork shaft 1 via a second locking member. The shift fork shaft 2 guides the second connecting seat, ensuring stable sliding operation of the shift fork 4. The shift fork 4, shift fork shaft 1, and shift fork shaft 2, respectively, utilize a plug-in sleeve design, resulting in a compact fit and good linkage.

[0032] 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 fastening 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. The assembly and disassembly are very simple and quick.

[0033] In this embodiment, the second locking member is a set screw that is screwed onto the second connecting seat, extends into the second through hole above, and abuts against the surface of the shift fork shaft 1. The use of a set screw for the second locking member facilitates assembly and disassembly.

[0034] As a preferred embodiment, the rear end of the shift fork 3 is provided with a first sleeve 31 which is sleeved on the fork shaft 2, the first sleeve 31 extends toward the shift fork 4, and a first limit block 32 extending downward is provided at the end thereof, the rear end of the shift fork 4 is provided with a second sleeve 41 which is sleeved on the fork shaft 1, the second sleeve 41 extends toward the shift fork 3, and a second limit block 42 extending downward is provided at the end thereof, the second limit block 42 is located on 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 the sides close to each other, the two notch grooves together enclose a limit groove, and the end of the first connecting member 7 extends into the limit groove.

[0035] In the above embodiment, the width of the end of the first connecting member 7 is approximately the same as the width of the limit slot formed by the two notches. When shifting to BC gear, the end of the first connecting member 7 is located in the notch of the first limit block 32. When shifting to AD gear, the second driving member 61 is operated to rotate upward, thereby driving the shift coupling 6 to rotate. The second connecting member 8 at one end of the shift coupling 6 will swing backward, thereby pushing the shift connecting rod 5 connected thereto to move backward. The end of the first connecting member 7 at the front end of the shift connecting rod 5 leaves the notch of the first limit block 32 and enters the notch of the second limit block 42. This design is very clever, and can take into account the left and right movement of the shift fork 3 when shifting to BC gear, and the left and right movement of the shift fork 4 when shifting to AD gear.

[0036] In this embodiment, the first connecting member 7 includes a first circular sleeve portion fixed to the front end of the shift link 5, and 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.

[0037] 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.

[0038] 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 link 5, and the end of the second connecting member 8 is embedded in the fitting groove.

[0039] In the above embodiment, when the first driving member 51 shifts from the BC to AD gear, the end of the second connecting member 8 pushes against the sidewall of the engagement groove, causing the shift link 5 to move forward and backward, thereby driving the end of the first connecting member 7 to move within the retaining groove. This design satisfies the displacement requirement of the second connecting member 8 relative to the shift link 5 during gear shifting.

[0040] In this embodiment, the second connecting member 8 comprises a second circular sleeve portion fixed to one end of the gear select coupling 6. A second, gradually narrowing extension portion is integrally formed at the lower portion of the second circular sleeve portion. The end of the second extension portion is provided with a second shift block that engages with a fitting groove. The well-designed shape of the second connecting member 8 closely matches the fitting groove, enabling flexible and efficient gear selection.

[0041] In this embodiment, the first driving member 51 comprises a first rocker arm perpendicularly mounted to the rear end of the shift link 5, with a first connecting hole defined at the end of the first rocker arm remote from the shift link 5. The second driving member 61 comprises a second rocker arm perpendicularly mounted to the other end of the shift select shaft 6, with a second connecting hole defined at the end of the second rocker arm remote from the shift select shaft 6. The first and second rocker arms are strategically positioned, with corresponding flexible shafts connected through the first and second connecting holes, respectively. Pulling the flexible shafts allows the first and second rocker arms to rotate, thereby rotating the shift link 5 and the shift select shaft 6 and switching gears.

[0042] It should be noted that: when the first rocker arm is located on one side of the central axis of the shift link 5, it is in the middle position. When the second rocker arm is in the initial state, the end of the first connecting member 7 is located in the shift fork 3. The first rocker arm rotates downward or upward relative to the middle position, and the first connecting member 7 drives the shift fork 3 to move left and right to reach gear C or gear B; when the second rocker arm swings backward, the end of the first connecting member 7 leaves the shift fork 3 and enters the gear selection fork 4 backward. The first rocker arm rotates downward or upward relative to the middle position, and the first connecting member 7 drives the gear selection fork 4 to move left and right to reach gear A or gear D.

[0043] As a preferred embodiment, Figure 2 、 3 As shown, it also includes a shell base 9, the front side of the shell base 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 base 9, and can move forward and backward and rotate relative to the shell base 9, the shift connecting shaft 6 is rotatably assembled on one side wall of the shell base 9, one end of the shift connecting shaft and the second connecting member 8 are located in the shell base 9, and the other end of the shift connecting shaft extends out of the shell base 9.

[0044] In the above embodiment, the design of the housing seat 9 facilitates the assembly of the shift link 5 and the gear selection shaft 6, making the operation more reasonable and convenient. Among them, 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.

[0045] Example 2 A tractor comprises the mechanical auxiliary speed change control system of embodiment 1.

[0046] In the description of the present invention, it should be understood that if there appear descriptive terms indicating orientation, direction or positional relationship, such as: "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "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, which is only for the convenience of understanding the present invention and simplifying the description, and does not indicate or imply that the part, element or whole referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0047] In addition, if there are order description terms, such as "first", "second", etc., their purpose in this specification is to facilitate understanding or simplify the description. For example, in order to distinguish multiple technical features with the same type or function, but they have to be mentioned separately, this specification may use prefix or suffix order description terms to distinguish them. Therefore, it cannot 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" can explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0048] In the present invention, if terms describing the relative functional relationship of structures are used, such as "install", "connect", "connect", "fix", etc., they should be understood in a broad sense unless otherwise clearly specified and limited. For example, "install", "connect", "connect", etc. can be fixed connections, detachable connections, or integrated; can be directly connected, or indirectly connected through an intermediate medium, can be internal communication between two elements, or an interactive relationship between two elements; "fix" can be fixed to form an integral body, or can be detachably fixed through fasteners; can be directly fixed, or can be fixed through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above-mentioned descriptive terms in the present invention can be understood according to the specific circumstances, the context, the coherence of the preceding and following texts, etc.

[0049] In the present invention, if descriptive terms with ancillary or connecting meaning appear, for example, a first feature being "on" or "below" a second feature, these should not be construed in a limiting sense unless otherwise expressly specified or limited. For example, "on" or "below" may refer to direct contact between the first and second features, or indirect contact between the first and second features through an intermediary. Persons of ordinary skill in the art will understand the specific meanings of these descriptive terms in the present invention based on the specific circumstances, context, and coherence of the preceding and following texts.

[0050] Furthermore, when a first feature is “above,” “above,” or “above” a second feature, it 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. When a first feature is “below,” “below,” or “below” a second feature, it 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.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" 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 representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments, examples and features of different embodiments and examples described in this specification, unless there is any contradiction, and these combinations or combinations should all fall within the scope of the present invention.

[0052] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are illustrative and are not to be construed as limiting the present invention. Changes, modifications, substitutions and variations of the above embodiments made by persons of ordinary skill in the art within the scope of information available through public channels and in combination with the technical inspiration provided by the present application documents are still within the scope of protection of the present application.

Claims

1. A mechanical auxiliary speed change control system, characterized by: 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 rod (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 in the upper and lower directions; the shift fork (3) and the gear selection fork (4) are arranged in spaced apart in the upper and lower directions and are both located in front of the shift fork shaft 1 (1), the rear end of the shift fork (3) is assembled with the shift fork shaft 2 (2), and the rear end of 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 movably connected to the rear ends of the shift fork (3) and the gear selection fork (4) respectively through a first connecting member (7), and the rear end of the shift connecting rod (5) is provided with a drive shaft The first driving member (51) drives the gear selection connecting shaft (6) to rotate; the gear selection connecting shaft (6) extends left and right and is located above the rear end of the gear shift 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 other end of the gear selection connecting shaft (6) is provided with a second driving member (61) for driving the gear selection connecting shaft (6) to rotate; when the gear selection connecting shaft (6) rotates, the gear shift connecting rod (5) is moved forward and backward through the second connecting member (8), and the gear shift connecting rod (5) drives the first connecting member (7) to enter the gear shift fork (3) or the gear selection fork (4); when the gear shift connecting rod (5) rotates, the gear shift fork (3) or the gear selection fork (4) is driven to move left and right through the first connecting member (7).

2. A mechanical auxiliary speed change control system according to claim 1, characterized in that: The rear end of the shift fork (3) is provided with a first connecting seat, and the first connecting seat is provided with first through holes distributed up and down. The shift fork shaft 1 (1) and the shift fork shaft 2 (2) respectively pass through the two first through holes up and down, and the first connecting seat is assembled with the shift fork shaft 2 (2) through a first locking member.

3. The 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. The 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, which are distributed up and down. The shift fork shaft 1 (1) and the shift fork shaft 2 (2) respectively pass through the two second through holes, and the second connecting seat is assembled with the shift fork shaft 1 (1) through a second locking member.

5. The mechanical auxiliary speed change 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 the surface of the fork shaft (1).

6. The mechanical auxiliary transmission control system according to claim 1, characterized in that: The rear end of the shift fork (3) is provided with a first sleeve (31) mounted on the second fork shaft (2), the first sleeve (31) extends toward the shift fork (4), and a first limit block (32) extending downward is provided at the end thereof, the rear end of the shift fork (4) is provided with a second sleeve (41) mounted on the first fork shaft (1), the second sleeve (41) extends toward the shift fork (3), and a second limit block (42) extending downward is provided at the end thereof, 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 the sides close to each other, the two notch grooves are enclosed together to form a limit groove, and the end of the first connecting member (7) extends into the limit groove.

7. The mechanical auxiliary transmission control system according to claim 1, characterized in that: An arc-shaped fitting 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 fitting groove.

8. The mechanical auxiliary transmission control system according to claim 1, characterized in that: The first driving member (51) includes a first rocker arm vertically arranged on 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) includes a second rocker arm vertically arranged on 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 speed change control system according to any one of claims 1 to 8, characterized in that: The invention also includes a housing seat (9), wherein 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), and the shift connecting shaft (6) is rotatably assembled on a side wall of the housing seat (9), one end of the shift connecting shaft and the second connecting member (8) are located in the housing seat (9), and the other end of the shift connecting shaft extends out of 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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