A variable speed control device

Abstract

The present invention provides a speed change control device, which includes: a main speed change control mechanism, a secondary speed change control mechanism, a plurality of main speed change fork shafts, a plurality of secondary speed change fork shafts, a plurality of main speed change forks, and a plurality of secondary speed change forks. The main speed change control mechanism is installed on the right side of the transmission housing, and the secondary speed change control mechanism is installed on the left side of the rear axle housing. The plurality of main speed change fork shafts are arranged longitudinally, and the plurality of secondary speed change fork shafts are arranged longitudinally. The plurality of main speed change forks are respectively installed on the plurality of main speed change fork shafts, and the plurality of secondary speed change forks are respectively installed on the plurality of secondary speed change fork shafts. The main speed change control mechanism is connected to the plurality of main speed change forks, and the secondary speed change control mechanism is connected to the plurality of secondary speed change forks. The main speed change control mechanism and the secondary speed change control mechanism are arranged on the side. The main and secondary speed change fork shafts are arranged vertically up and down, with high operating comfort, convenient operation, reasonable ergonomics, small occupied space, and compact overall structure, effectively improving the passing performance of the whole machine.

Description

Technical Field

[0001] The present invention relates to a vehicle control device, and more particularly to a shift control device. Background Art

[0002] Currently, the main and auxiliary shift control mechanisms of small-horsepower tractors are mainly divided into two methods: center-mounted control and side-mounted control. The shift control lever of the center-mounted control is located in the middle of the cab floor. This control method occupies a large space in the cab. The driver needs to lift his legs to step over when getting in and out of the vehicle, and needs to lean forward to shift gears during operation, which easily increases the driver's fatigue and the ergonomic comfort is poor. Most of the side-mounted control mechanisms have the main and auxiliary shift controls adjacent to each other on the same side, and the control cover is placed above the transmission housing. The main and auxiliary shift fork shafts are arranged horizontally from left to right. The side control cover is relatively long and occupies a large space, resulting in an overall increase in the floor height or an inability to make a flat floor.

[0003] Disadvantages of the existing structure: The existing structure is installed on the upper end face of the housing, occupying a large space and affecting the passing performance of the whole machine; the shift control lever is arranged on one side, and the control comfort is poor. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a shift control device in view of the deficiencies of the prior art.

[0005] The technical solution of the present invention to solve the above technical problem is as follows: A shift control device includes: a main shift control mechanism, an auxiliary shift control mechanism, a plurality of main shift fork shafts, a plurality of auxiliary shift fork shafts, a plurality of main shift forks, a plurality of auxiliary shift forks, a transmission housing, and a rear axle housing. The transmission housing is connected to the rear axle housing. The main shift control mechanism is installed on the right side of the transmission housing, and the auxiliary shift control mechanism is installed on the left side of the rear axle housing. The plurality of main shift fork shafts are arranged longitudinally, the plurality of auxiliary shift fork shafts are arranged longitudinally, the plurality of main shift forks are respectively installed on the plurality of main shift fork shafts, the plurality of auxiliary shift forks are respectively installed on the plurality of auxiliary shift fork shafts, the main shift control mechanism is connected to the plurality of main shift forks, and the auxiliary shift control mechanism is connected to the plurality of auxiliary shift forks.

[0006] The beneficial effects of adopting the technical solution of the present invention are: The side-mounted main shift control mechanism and auxiliary shift control mechanism have the main and auxiliary shift fork shafts arranged vertically up and down. The control comfort is high, the operation is convenient, the ergonomics is reasonable, the occupied space is small, the overall structure is compact, and the passing performance of the whole machine is effectively improved. The main shift control mechanism is installed on the right side of the transmission housing, and the auxiliary shift control mechanism is installed on the left side of the rear axle housing, separating the main and auxiliary shift controls independently from each other without mutual influence.

[0007] Further, the main transmission control mechanism includes: a main transmission assembly component with gear selection and shifting functions, and a main transmission chassis component with gear selection and shifting functions. The main transmission assembly component is connected to the main transmission chassis component. The main transmission assembly component is installed on the right side of the transmission housing, and the main transmission chassis component is connected to a plurality of main transmission shift forks. The auxiliary transmission control mechanism includes: an auxiliary transmission assembly component with gear selection and shifting functions, and an auxiliary transmission chassis component with gear selection and shifting functions. The auxiliary transmission assembly component is connected to the auxiliary transmission chassis component. The auxiliary transmission assembly component is installed on the left side of the rear axle housing, and the auxiliary transmission chassis component is connected to a plurality of auxiliary transmission shift forks.

[0008] The beneficial effects of adopting the above further technical solution are as follows: The main transmission control mechanism is mainly divided into a main transmission chassis component (mainly a casting) and a main transmission assembly component (mainly a bent rod). Both parts can be separately assembled. The auxiliary transmission control mechanism is mainly divided into an auxiliary transmission chassis component (mainly a casting) and an auxiliary transmission assembly component (mainly a bent rod). Both parts can be separately assembled. The main and auxiliary transmission control mechanisms are independent of each other and are side-mounted and distributed on both sides.

[0009] Further, the main transmission assembly component includes: a main transmission control lever, a main transmission gear selection rocker arm, a main transmission shifting rocker arm, a main transmission gear selection pull rod assembly, a main transmission shifting pull rod assembly, and a main transmission control bracket welded assembly. The bottom of the main transmission control lever is respectively connected to the main transmission gear selection rocker arm and the main transmission shifting rocker arm. The tops of the main transmission gear selection rocker arm and the main transmission shifting rocker arm are rotatably installed on the main transmission control bracket welded assembly. The main transmission control bracket welded assembly is installed on the transmission housing. The top of the main transmission gear selection pull rod assembly is hinged to the bottom of the main transmission gear selection rocker arm. The top of the main transmission shifting pull rod assembly is hinged to the bottom of the main transmission shifting rocker arm. The bottoms of the main transmission gear selection pull rod assembly and the main transmission shifting pull rod assembly are both connected to the main transmission chassis component.

[0010] The beneficial effects of adopting the above further technical solution are as follows: The side-mounted control structure effectively solves the problems that the large space occupied by the control leads to the inability to reduce the overall height and width of the machine, the floor cannot be designed flat, and the passing performance of the whole machine is poor. The main and auxiliary transmission control mechanisms are independent of each other, and installation and maintenance are more convenient. The main and auxiliary transmission control cover assemblies and the control levers are independently arranged, and the arrangement position of the control levers can be flexibly selected according to ergonomic requirements, making shifting more convenient and the control comfort higher. The integration degree of the control lever and the control cover assembly is high, and both can be pre-assembled separately.

[0011] Further, the main transmission gear selection rocker arm is of an L-shaped structure. A main transmission control handle is installed at the top of the main transmission control lever. The tops of the main transmission gear selection rocker arm and the main transmission gear shifting rocker arm are both rotatably installed on the welded main transmission control bracket through universal joints. The top of the main transmission gear selection pull rod assembly is hinged to the bottom of the main transmission gear selection rocker arm (9) through a ball joint. The top of the main transmission gear shifting pull rod assembly is hinged to the bottom of the main transmission gear shifting rocker arm through a ball joint.

[0012] The beneficial effects of adopting the above further technical solution are as follows: The integration degree of the control lever and the control cover assembly is high, and both can be pre-assembled. The setting of the main transmission control handle is convenient for the user to hold and convenient to operate the main transmission control lever through the main transmission control handle. The settings of the universal joint and the ball joint are convenient for the rotational connection of components, enabling flexible movement and reducing costs.

[0013] Further, the main transmission chassis components include: a main transmission control cover gear shifting rocker arm, a main transmission control cover gear selection rocker arm, a shifting lever 1, a gear selection head 1, a gear selection shaft 1, and a main transmission control side cover. The main transmission control side cover is installed on the right side of the transmission housing. The top of the main transmission control cover gear shifting rocker arm is hinged to the bottom of the main transmission gear shifting pull rod assembly. The shifting lever 1 is rotatably installed in the main transmission control side cover. The bottom of the main transmission control cover gear shifting rocker arm is connected to one end of the shifting lever 1. The gear selection head 1 and the gear selection shaft 1 are both installed in the main transmission control side cover. One end of the main transmission control cover gear selection rocker arm is connected to the bottom of the main transmission gear selection pull rod assembly, and the other end of the main transmission control cover gear selection rocker arm is connected to the gear selection shaft 1. The gear selection head 1 is installed on the gear selection shaft 1, and the free end of the gear selection head 1 is connected to the shifting lever 1. The multiple main transmission forks include: a 1-2 gear fork and a 3-4 gear fork. The multiple main transmission fork shafts include: a 1-2 gear fork shaft and a 3-4 gear fork shaft. The 1-2 gear fork shaft and the 3-4 gear fork shaft are arranged vertically up and down. The 1-2 gear fork is installed on the 1-2 gear fork shaft, and the 3-4 gear fork is installed on the 3-4 gear fork shaft. A shifting block 1 is installed on the 3-4 gear fork shaft. The shifting block 1 is located between the 3-4 gear fork and the 1-2 gear fork. The other end of the shifting lever 1 is connected to the 1-2 gear fork, the 3-4 gear fork, or the shifting block 1.

[0014] The beneficial effects of adopting the above further technical solution are as follows: The operating side cover and the operating handle are respectively arranged on the left and right sides of the gearbox housing and the rear axle housing. The side operating cover and the operating rod are independently arranged, with high operating comfort, convenient operation, reasonable ergonomics, small occupied space, and a compact overall structure, effectively improving the passing performance of the whole machine. The tip of the first shift lever is sleeved on the shift groove of the shift fork or the shift block, and the rotation of the first shift lever can drive the shift fork or the shift block to move axially along the shift fork shaft. The integration degree of the operating rod and the operating cover assembly is high, and both can be pre-assembled separately.

[0015] Further, a first shift return spring and a first snap ring are sleeved on the first shift lever. One end of the first shift return spring abuts against the main transmission operating side cover, and the other end of the first shift return spring abuts against the other end of the first shift lever. One end of the first snap ring abuts against one end of the first shift lever, and the other end of the first snap ring abuts against the shift rocker arm of the main transmission operating cover. The bottom of the shift rocker arm of the main transmission operating cover is connected to one end of the first shift lever through a spline. The other end of the shift selector rocker arm of the main transmission operating cover is connected to the first shift selector shaft through an elastic cylindrical pin. The first shift selector head is installed on the first shift selector shaft through a first fastening screw. A clamping groove is formed in the middle of the first shift lever, and the free end of the first shift selector head is installed in the clamping groove.

[0016] The beneficial effects of adopting the above further technical solution are as follows: The first snap ring is assembled on the first shift lever to play a limiting role, and the first shift return spring installed on the first shift lever can return the first shift lever. There is a clamping groove on the first shift lever, and the tip of the first shift selector head placed on the clamping groove can drive the first shift lever to move axially. The integration degree of the operating rod and the operating cover assembly is high, and both can be pre-assembled separately.

[0017] Further, the auxiliary transmission assembly components include: an auxiliary transmission operating rod, an auxiliary transmission shift selector rocker arm, an auxiliary transmission shift rocker arm, an auxiliary transmission shift selector pull rod assembly, an auxiliary transmission shift pull rod assembly, and an auxiliary transmission operating bracket welded assembly. The bottom of the auxiliary transmission operating rod is respectively connected to the auxiliary transmission shift selector rocker arm and the auxiliary transmission shift rocker arm. The tops of the auxiliary transmission shift selector rocker arm and the auxiliary transmission shift rocker arm are rotatably installed on the auxiliary transmission operating bracket welded assembly. The auxiliary transmission operating bracket welded assembly is installed on the rear axle housing. The top of the auxiliary transmission shift selector pull rod assembly is hinged to the bottom of the auxiliary transmission shift selector rocker arm. The top of the auxiliary transmission shift pull rod assembly is hinged to the bottom of the auxiliary transmission shift rocker arm. The bottoms of the auxiliary transmission shift selector pull rod assembly and the auxiliary transmission shift pull rod assembly are both connected to the auxiliary transmission chassis components.

[0018] The beneficial effects of adopting the above further technical solution are as follows: The side-mounted control structure effectively solves the problems that the large space occupied by the control leads to the inability to reduce the overall height and width of the machine, the floor cannot be designed flat, and the passability of the whole machine is poor. The main and auxiliary transmission control mechanisms are independent of each other, making installation and maintenance more convenient. The main and auxiliary transmission control cover assemblies and the control lever are arranged independently, and the arrangement position of the control lever can be flexibly selected according to the ergonomic requirements, making gear shifting more convenient and the control comfort higher. The integration degree of the control lever and the control cover assembly is high, and both can be pre-assembled separately.

[0019] Further, the auxiliary transmission gear selection rocker arm is of an L-shaped structure, a control handle for the auxiliary transmission is installed at the top of the auxiliary transmission control lever, the tops of the auxiliary transmission gear selection rocker arm and the auxiliary transmission gear shifting rocker arm are both rotatably installed on the welded auxiliary transmission control bracket through universal joints, the top of the auxiliary transmission gear selection pull rod assembly is hinged to the bottom of the auxiliary transmission gear selection rocker arm through a ball joint, and the top of the auxiliary transmission gear shifting pull rod assembly is hinged to the bottom of the auxiliary transmission gear shifting rocker arm through a ball joint.

[0020] The beneficial effects of adopting the above further technical solution are as follows: The integration degree of the control lever and the control cover assembly is high, and both can be pre-assembled separately. The setting of the control handle for the auxiliary transmission is convenient for the user to hold and convenient for operating the auxiliary transmission control lever through the main transmission control handle. The settings of the universal joint and the ball joint are convenient for the rotational connection of components, enabling flexible movement and reducing costs.

[0021] Further, the auxiliary transmission chassis components include: an auxiliary transmission control cover shift rocker arm, an auxiliary transmission control cover gear selection rocker arm, a shift lever II, a gear selection head II, a gear selection shaft II, and an auxiliary transmission control side cover. The auxiliary transmission control side cover is installed on the left side of the rear axle housing. The top of the auxiliary transmission control cover shift rocker arm is hinged to the bottom of the auxiliary transmission shift pull rod assembly. The shift lever II is rotatably installed in the auxiliary transmission control side cover. The bottom of the auxiliary transmission control cover shift rocker arm is connected to one end of the shift lever II. The gear selection head II and the gear selection shaft II are both installed in the auxiliary transmission control side cover. One end of the auxiliary transmission control cover gear selection rocker arm is connected to the bottom of the auxiliary transmission gear selection pull rod assembly, and the other end of the auxiliary transmission control cover gear selection rocker arm is connected to the gear selection shaft II. The gear selection head II is installed on the gear selection shaft II, and the free end of the gear selection head II is connected to the shift lever II. The plurality of auxiliary transmission forks include: a medium gear fork and a high / low gear fork. The plurality of auxiliary transmission fork shafts include: a medium gear fork shaft and a high / low gear fork shaft. The medium gear fork shaft and the high / low gear fork shaft are arranged vertically up and down. The medium gear fork is installed on the medium gear fork shaft, and the high / low gear fork is installed on the high / low gear fork shaft. A shift block II is installed on the high / low gear fork shaft, and the shift block II is located between the medium gear fork and the high / low gear fork. The other end of the shift lever II is connected to the medium gear fork, the high / low gear fork, or the shift block II.

[0022] The beneficial effects of adopting the above further technical solution are as follows: The control side cover and the control handle are respectively arranged on the left and right sides of the gearbox housing and the rear axle housing. The side control cover and the control lever are independently arranged, with high control comfort, convenient operation, reasonable ergonomics, small occupied space, and a compact overall structure, effectively improving the passing performance of the whole machine. The head of the shift lever II is sleeved in the shift groove of the fork or the head, and the rotation of the shift lever II can drive the fork or the block to move axially along the fork shaft. The integration degree of the control lever and the control cover assembly is high, and both can be pre-assembled.

[0023] Further, a gear selection return spring II and a snap ring II are sleeved on the shift lever II. One end of the gear selection return spring II abuts against the auxiliary transmission control side cover, and the other end of the gear selection return spring II abuts against the other end of the shift lever II. One end of the snap ring II abuts against one end of the shift lever II, and the other end of the snap ring II abuts against the auxiliary transmission control cover shift rocker arm. The bottom of the auxiliary transmission control cover shift rocker arm is connected to one end of the shift lever II through a spline. The other end of the auxiliary transmission control cover gear selection rocker arm is connected to the gear selection shaft II through an elastic cylindrical pin. The gear selection head II is installed on the gear selection shaft II through a fastening screw II. A slot is provided in the middle of the shift lever II, and the free end of the gear selection head II is installed in the slot.

[0024] The beneficial effects of adopting the above further technical solution are as follows: The snap ring II is assembled on the shift lever II to play a limiting role, and the shift return spring II is installed on the shift lever II to enable the shift lever II to return to its original position. There is a slot on the shift lever II, and the tip of the shift selector tip II is placed on the slot to drive the shift lever II to move axially. The integration of the operating lever and the operating cover assembly is high, and both can be pre-assembled separately.

[0025] Advantages of additional aspects of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of the transmission control device provided by an embodiment of the present invention.

[0027] Figure 2 It is a schematic structural diagram of the main transmission control mechanism provided by an embodiment of the present invention.

[0028] Figure 3 It is Figure 2 The G-direction view of the structure shown.

[0029] Figure 4 It is Figure 3 The D-direction view of the structure shown.

[0030] Figure 5 It is Figure 3 The sectional view of the structure shown along the section line A-A.

[0031] Figure 6 It is Figure 2 The H-direction view of the structure shown.

[0032] Figure 7 It is Figure 6 The K-direction view of the structure shown.

[0033] Figure 8 It is a schematic structural diagram of the auxiliary transmission control mechanism provided by an embodiment of the present invention.

[0034] Figure 9 It is Figure 8 The C-direction view of the structure shown.

[0035] Figure 10 It is Figure 9 The F-direction view of the structure shown.

[0036] Figure 11 It is Figure 9 The sectional view of the structure shown along the section line B-B.

[0037] Figure 12 It is Figure 8 The J-direction view of the structure shown.

[0038] Figure 13 The Figure 12 L-direction view of the shown structure.

[0039] Explanation of the reference numerals in the attached drawings: 1. Auxiliary speed shift control lever; 2. Auxiliary speed shift selection rocker arm; 3. Auxiliary speed shift shifting rocker arm; 4. Auxiliary speed shift selection rod assembly; 5. Auxiliary speed shift shifting rod assembly; 6. Auxiliary speed shift control cover shifting rocker arm; 7. Auxiliary speed shift control cover selection rocker arm; 8. Main speed shift control lever; 9. Main speed shift selection rocker arm; 10. Main speed shift shifting rocker arm; 11. Main speed shift selection rod assembly; 12. Main speed shift shifting rod assembly; 13. Main speed shift control cover shifting rocker arm; 14. Main speed shift control cover selection rocker arm; 15. Main speed shift control mechanism; 16. Shifting lever II; 17. High-low gear shift fork; 18. Medium gear shift fork; 19. 3-4 gear shift fork; 20. 1-2 gear shift fork; 21. Shifting lever I; 22. Selection return spring I; 23. Welded assembly of main speed shift control bracket; 24. Cup plug I; 25. Auxiliary speed shift control handle; 26. Oil seal I; 27. Auxiliary speed shift control mechanism; 28. Fastening screw I; 29. Selection head I; 30. Selection shaft I; 31. Side cover of main speed shift control; 32. Side cover of auxiliary speed shift control; 33. Snap ring I; 34. Main speed shift control handle; 35. 1-2 gear shift fork shaft; 36. 3-4 gear shift fork shaft; 37. High-low gear shift fork shaft; 38. Medium gear shift fork shaft; 39. Shifting block I; 40. Shifting block II; 41. Selection head II; 42. Selection shaft II; 43. Main speed shift fork shaft; 44. Snap ring II; 45. Fastening screw II; 46. Selection return spring II; 47. Oil seal II; 48. Cup plug II; 49. Auxiliary speed shift fork shaft; 50. Main speed shift fork; 51. Auxiliary speed shift fork; 52. Transmission case; 53. Rear axle case; 54. Main speed shift assembly component; 55. Main speed shift chassis component; 56. Auxiliary speed shift assembly component; 57. Auxiliary speed shift chassis component; 58. Welded assembly of auxiliary speed shift control bracket. Specific embodiments

[0040] The principles and features of the present invention will be described below in conjunction with the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0041] As Figures 1 to 13As shown in the figure, an embodiment of the present invention provides a variable speed control device, which includes: a main speed control mechanism 15, a secondary speed control mechanism 27, a plurality of main speed shifting fork shafts 43, a plurality of secondary speed shifting fork shafts 49, a plurality of main speed shifting forks 50, a plurality of secondary speed shifting forks 51, a transmission housing 52, and a rear axle housing 53. The transmission housing 52 is connected to the rear axle housing 53. The main speed control mechanism 15 is installed on the right side of the transmission housing 52, and the secondary speed control mechanism 27 is installed on the left side of the rear axle housing 53. A plurality of the main speed shifting fork shafts 43 are arranged longitudinally, and a plurality of the secondary speed shifting fork shafts 49 are arranged longitudinally. A plurality of the main speed shifting forks 50 are correspondingly installed on a plurality of the main speed shifting fork shafts 43, and a plurality of the secondary speed shifting forks 51 are correspondingly installed on a plurality of the secondary speed shifting fork shafts 49. The main speed control mechanism 15 is connected to a plurality of the main speed shifting forks 50, and the secondary speed control mechanism 27 is connected to a plurality of the secondary speed shifting forks 51.

[0042] The beneficial effects of adopting the technical solution of the present invention are as follows: The main speed control mechanism and the secondary speed control mechanism are side-mounted. The main and secondary speed shifting fork shafts are arranged longitudinally up and down. It has high operating comfort, convenient operation, reasonable ergonomics, small occupied space, and a compact overall structure, effectively improving the passing performance of the whole machine. The main speed control mechanism is installed on the right side of the transmission housing, and the secondary speed control mechanism is installed on the left side of the rear axle housing, separating the main and secondary speed controls independently from each other without mutual influence.

[0043] As Figures 1 to 13 shown in the figure, further, the main speed control mechanism 15 includes: a main speed general assembly component 54 with gear selection and shifting functions and a main speed chassis component 55 with gear selection and shifting functions. The main speed general assembly component 54 is connected to the main speed chassis component 55. The main speed general assembly component 54 is installed on the right side of the transmission housing 52, and the main speed chassis component 55 is connected to a plurality of the main speed shifting forks 50. The secondary speed control mechanism 27 includes: a secondary speed general assembly component 56 with gear selection and shifting functions and a secondary speed chassis component 57 with gear selection and shifting functions. The secondary speed general assembly component 56 is connected to the secondary speed chassis component 57. The secondary speed general assembly component 56 is installed on the left side of the rear axle housing 53, and the secondary speed chassis component 57 is connected to a plurality of the secondary speed shifting forks 51.

[0044] The beneficial effects of adopting the above further technical solution are as follows: The main speed control mechanism is mainly divided into a main speed chassis component (mainly a casting) and a main speed general assembly component (mainly a bent rod). Both parts can be separately assembled. The secondary speed control mechanism is mainly divided into a secondary speed chassis component (mainly a casting) and a secondary speed general assembly component (mainly a bent rod). Both parts can be separately assembled. The main and secondary speed control mechanisms are independent of each other and are side-mounted on both sides.

[0045] As Figures 2 to 7 shown, further, the main transmission assembly component 54 includes: a main transmission control lever 8, a main transmission gear selection rocker arm 9, a main transmission shifting rocker arm 10, a main transmission gear selection pull rod assembly 11, a main transmission shifting pull rod assembly 12, and a main transmission control bracket welded assembly 23. The bottom of the main transmission control lever 8 is respectively connected to the main transmission gear selection rocker arm 9 and the main transmission shifting rocker arm 10. The tops of the main transmission gear selection rocker arm 9 and the main transmission shifting rocker arm 10 are rotatably installed on the main transmission control bracket welded assembly 23. The main transmission control bracket welded assembly 23 is installed on the transmission housing 52. The top of the main transmission gear selection pull rod assembly 11 is hinged to the bottom of the main transmission gear selection rocker arm 9. The top of the main transmission shifting pull rod assembly 12 is hinged to the bottom of the main transmission shifting rocker arm 10. The bottoms of the main transmission gear selection pull rod assembly 11 and the main transmission shifting pull rod assembly 12 are both connected to the main transmission chassis component 55.

[0046] The beneficial effects of adopting the above further technical solution are: The side-mounted control structure effectively solves the problems that the large space occupied by the control leads to the inability to reduce the overall height and width of the machine, the floor cannot be designed flat, and the passability of the whole machine is poor. The main and auxiliary transmission control mechanisms are independent of each other, and installation and maintenance are more convenient. The main and auxiliary transmission control cover assemblies and the control lever are arranged independently, and the arrangement position of the control lever can be flexibly selected according to the ergonomic requirements, making shifting more convenient and the control comfort high. The integration degree of the control lever and the control cover assembly is high, and both can be pre-assembled.

[0047] As Figures 2 to 7 shown, further, the main transmission gear selection rocker arm 9 is of an L-shaped structure. A main transmission control handle 34 is installed at the top of the main transmission control lever 8. The tops of the main transmission gear selection rocker arm 9 and the main transmission shifting rocker arm 10 are rotatably installed on the main transmission control bracket welded assembly 23 through universal joints. The top of the main transmission gear selection pull rod assembly 11 is hinged to the bottom of the main transmission gear selection rocker arm 9 through a ball joint. The top of the main transmission shifting pull rod assembly 12 is hinged to the bottom of the main transmission shifting rocker arm 10 through a ball joint.

[0048] The beneficial effects of adopting the above further technical solution are: The integration degree of the control lever and the control cover assembly is high, and both can be pre-assembled. The setting of the main transmission control handle is convenient for the user to hold and convenient to operate the main transmission control lever through the main transmission control handle. The settings of the universal joint and the ball joint are convenient for the rotational connection of components, enabling flexible movement and reducing costs.

[0049] As Figures 2 to 7As shown in the figure, further, the main transmission chassis component 55 includes: a main transmission control cover shift rocker arm 13, a main transmission control cover shift selector rocker arm 14, a shift lever 21, a shift selector head 29, a shift selector shaft 30, and a main transmission control side cover 31. The main transmission control side cover 31 is installed on the right side of the transmission housing 52. The top of the main transmission control cover shift rocker arm 13 is hinged to the bottom of the main transmission shift pull rod assembly 12. The shift lever 21 is rotatably installed in the main transmission control side cover 31. The bottom of the main transmission control cover shift rocker arm 13 is connected to one end of the shift lever 21. The shift selector head 29 and the shift selector shaft 30 are both installed in the main transmission control side cover 31. One end of the main transmission control cover shift selector rocker arm 14 is connected to the bottom of the main transmission shift selector pull rod assembly 11, and the other end of the main transmission control cover shift selector rocker arm 14 is connected to the shift selector shaft 30. The shift selector head 29 is installed on the shift selector shaft 30, and the free end of the shift selector head 29 is connected to the shift lever 21. The plurality of main transmission shift forks 50 include: a 1-2 gear shift fork 20 and a 3-4 gear shift fork 19. The plurality of main transmission shift fork shafts 43 include: a 1-2 gear shift fork shaft 35 and a 3-4 gear shift fork shaft 36. The 1-2 gear shift fork shaft 35 and the 3-4 gear shift fork shaft 36 are arranged vertically up and down. The 1-2 gear shift fork 20 is installed on the 1-2 gear shift fork shaft 35, and the 3-4 gear shift fork 19 is installed on the 3-4 gear shift fork shaft 36. A shift block 39 is installed on the 3-4 gear shift fork shaft 36. The shift block 39 is located between the 3-4 gear shift fork 19 and the 1-2 gear shift fork 20. The other end of the shift lever 21 is connected to the 1-2 gear shift fork 20, the 3-4 gear shift fork 19, or the shift block 39.

[0050] The beneficial effects of adopting the above further technical solution are as follows: The control side cover and the control handle are respectively arranged on the left and right sides of the transmission housing and the rear axle housing. The side control cover and the control lever are independently arranged, with high control comfort, convenient operation, reasonable ergonomics, small occupied space, and a compact overall structure, effectively improving the passability of the whole machine. The head of the shift lever 21 is sleeved in the shift groove of the shift fork or the shift block, and the rotation of the shift lever 21 can drive the shift fork or the shift block to move axially along the shift fork shaft. The integration degree of the control lever and the control cover assembly is high, and both can be pre-assembled separately.

[0051] As Figures 2 to 7As shown in the figure, further, a first shift lever return spring 22 and a first snap ring 33 are sleeved on the first shift lever 21. One end of the first shift lever return spring 22 abuts against the main transmission control side cover 31, and the other end of the first shift lever return spring 22 abuts against the other end of the first shift lever 21. One end of the first snap ring 33 abuts against one end of the first shift lever 21, and the other end of the first snap ring 33 abuts against the shift rocker arm 13 of the main transmission control cover. The bottom of the shift rocker arm 13 of the main transmission control cover is connected to one end of the first shift lever 21 through a spline. The other end of the selection rocker arm 14 of the main transmission control cover is connected to the first selection shaft 30 through an elastic cylindrical pin. The first selection head 29 is installed on the first selection shaft 30 through a first fastening screw 28. A card slot is provided in the middle of the first shift lever 21, and the free end of the first selection head 29 is installed in the card slot.

[0052] The beneficial effects of adopting the above further technical solution are as follows: The first snap ring is assembled on the first shift lever to play a limiting role, and the first shift lever return spring installed on the first shift lever can return the first shift lever. There is a card slot on the first shift lever, and the head of the first selection head placed on the card slot can drive the first shift lever to move axially. The integration degree of the control lever and the control cover assembly is high, and both can be pre-assembled separately.

[0053] As Figures 8 to 13 As shown in the figure, further, the auxiliary transmission assembly 56 includes: an auxiliary transmission control lever 1, an auxiliary transmission selection rocker arm 2, an auxiliary transmission shift rocker arm 3, an auxiliary transmission selection rod assembly 4, an auxiliary transmission shift rod assembly 5, and an auxiliary transmission control bracket welded part 58. The bottom of the auxiliary transmission control lever 1 is respectively connected to the auxiliary transmission selection rocker arm 2 and the auxiliary transmission shift rocker arm 3. The tops of the auxiliary transmission selection rocker arm 2 and the auxiliary transmission shift rocker arm 3 are rotatably installed on the auxiliary transmission control bracket welded part 58. The auxiliary transmission control bracket welded part 58 is installed on the rear axle housing 53. The top of the auxiliary transmission selection rod assembly 4 is hinged to the bottom of the auxiliary transmission selection rocker arm 2. The top of the auxiliary transmission shift rod assembly 5 is hinged to the bottom of the auxiliary transmission shift rocker arm 3. The bottoms of the auxiliary transmission selection rod assembly 4 and the auxiliary transmission shift rod assembly 5 are both connected to the auxiliary transmission chassis part 57.

[0054] The beneficial effects of adopting the above further technical solution are as follows: The side-mounted control structure effectively solves the problems that the control occupies a large space, resulting in the inability to reduce the overall height and width of the machine, the floor cannot be designed flat, and the passing performance of the whole machine is poor. The main and auxiliary transmission control mechanisms are independent of each other, making installation and maintenance more convenient. The main and auxiliary transmission control cover assemblies and the control lever are arranged independently, and the arrangement position of the control lever can be flexibly selected according to the requirements of ergonomics, making shifting more convenient and the control comfort high. The integration degree of the control lever and the control cover assembly is high, and both can be pre-assembled separately.

[0055] As Figures 8 to 13 shown, further, the auxiliary speed change gear shift rocker arm 2 has an L-shaped structure. An auxiliary speed change control handle 25 is installed at the top of the auxiliary speed change control lever 1. The tops of the auxiliary speed change gear shift rocker arm 2 and the auxiliary speed change shift rocker arm 3 are both rotatably installed on the auxiliary speed change control bracket weldment 58 through universal joints. The top of the auxiliary speed change gear shift pull rod assembly 4 is hinged to the bottom of the auxiliary speed change gear shift rocker arm 2 through a ball joint. The top of the auxiliary speed change shift pull rod assembly 5 is hinged to the bottom of the auxiliary speed change shift rocker arm 3 through a ball joint.

[0056] The beneficial effects of adopting the above further technical solution are as follows: The integration degree of the control lever and the control cover assembly is high, and both can be pre-assembled separately. The setting of the auxiliary speed change control handle is convenient for the user to hold and convenient for operating the auxiliary speed change control lever through the main speed change control handle. The settings of the universal joint and the ball joint are convenient for the rotational connection of components, enabling flexible movement and reducing costs.

[0057] As Figures 8 to 13 shown, further, the auxiliary speed change chassis component 57 includes: an auxiliary speed change control cover shift rocker arm 6, an auxiliary speed change control cover gear shift rocker arm 7, a shift lever two 16, a gear shift head two 41, a gear shift shaft two 42, and an auxiliary speed change control side cover 32. The auxiliary speed change control side cover 32 is installed on the left side of the rear axle housing 53. The top of the auxiliary speed change control cover shift rocker arm 6 is hinged to the bottom of the auxiliary speed change shift pull rod assembly 5. The shift lever two 16 is rotatably installed in the auxiliary speed change control side cover 32. The bottom of the auxiliary speed change control cover shift rocker arm 6 is connected to one end of the shift lever two 16. The gear shift head two 41 and the gear shift shaft two 42 are both installed in the auxiliary speed change control side cover 32. One end of the auxiliary speed change control cover gear shift rocker arm 7 is connected to the bottom of the auxiliary speed change gear shift pull rod assembly 4. The other end of the auxiliary speed change control cover gear shift rocker arm 7 is connected to the gear shift shaft two 42. The gear shift head two 41 is installed on the gear shift shaft two 42. The free end of the gear shift head two 41 is connected to the shift lever two 16; the plurality of auxiliary speed change shift forks 51 include: a medium gear shift fork 18 and a high / low gear shift fork 17. The plurality of auxiliary speed change shift fork shafts 49 include: a medium gear shift fork shaft 38 and a high / low gear shift fork shaft 37. The medium gear shift fork shaft 38 and the high / low gear shift fork shaft 37 are arranged vertically up and down. The medium gear shift fork 18 is installed on the medium gear shift fork shaft 38. The high / low gear shift fork 17 is installed on the high / low gear shift fork shaft 37. A shift block two 40 is installed on the high / low gear shift fork shaft 37. The shift block two 40 is located between the medium gear shift fork 18 and the high / low gear shift fork 17. The other end of the shift lever two 16 is connected to the medium gear shift fork 18, the high / low gear shift fork 17, or the shift block two 40.

[0058] The beneficial effects of adopting the above further technical solution are as follows: The operating side cover and the operating handle are respectively arranged on the left and right sides of the gearbox housing and the rear axle housing. The side operating cover and the operating lever are independently arranged, with high operating comfort, convenient operation, reasonable ergonomics, small occupied space, and a compact overall structure, effectively improving the passability of the whole machine. The tip of the second shifting lever is sleeved on the shifting groove of the shifting fork or the tip. The rotation of the second shifting lever can drive the shifting fork or the shifting block to move axially along the shifting fork shaft. The integration degree of the operating lever and the operating cover assembly is high, and both can be pre-assembled separately.

[0059] As Figures 8 to 13 shown, further, a second gear selection return spring 46 and a second circlip 44 are sleeved on the second shifting lever 16. One end of the second gear selection return spring 46 abuts against the auxiliary transmission operating side cover 32, and the other end of the second gear selection return spring 46 abuts against the other end of the second shifting lever 16. One end of the second circlip 44 abuts against one end of the second shifting lever 16, and the other end of the second circlip 44 abuts against the shifting rocker arm of the auxiliary transmission operating cover 6. The bottom of the shifting rocker arm of the auxiliary transmission operating cover 6 is connected to one end of the second shifting lever 16 through a spline. The other end of the gear selection rocker arm of the auxiliary transmission operating cover 7 is connected to the second gear selection shaft 42 through an elastic cylindrical pin. The second gear selection tip 41 is installed on the second gear selection shaft 42 through a second fastening screw 45. A clamping groove is formed in the middle of the second shifting lever 16, and the free end of the second gear selection tip 41 is installed in the clamping groove.

[0060] The beneficial effects of adopting the above further technical solution are as follows: The second circlip is assembled on the second shifting lever to play a limiting role, and the second gear selection return spring installed on the second shifting lever can return the second shifting lever. There is a clamping groove on the second shifting lever, and the tip of the second gear selection tip placed in the clamping groove can drive the second shifting lever to move axially. The integration degree of the operating lever and the operating cover assembly is high, and both can be pre-assembled separately.

[0061] The object of the present invention is to design a side-mounted transmission operating device with high operating comfort, convenient operation, and reasonable ergonomics. The operating side cover and the operating handle are respectively arranged on the left and right sides of the gearbox housing and the rear axle housing. The main and auxiliary transmission shifting fork shafts are both arranged vertically up and down. The side operating cover and the operating lever are independently arranged, with small occupied space, a compact overall structure, effectively improving the passability of the whole machine, and a large operating space in the cab, enhancing the operating comfort of ergonomics.

[0062] The operating mechanism of the present invention includes two parts: a main transmission operating mechanism and an auxiliary transmission operating mechanism. The main transmission operating mechanism is installed on the right side of the gearbox housing, and the auxiliary transmission operating mechanism is installed on the left side of the rear axle housing. Compared with the existing structure, the main and auxiliary transmission operations are completely independently separated from each other without mutual influence.

[0063] The main transmission control mechanism is mainly divided into a chassis part (i.e., the main transmission chassis component, mainly a casting) and an assembly part (i.e., the main transmission assembly component, mainly bent rods). Both parts can be separately assembled.

[0064] The assembly part of the main transmission control mechanism includes: The main transmission control handle 34 is installed on the main transmission control lever 8. The main transmission gear selection rocker arm 9 and the main transmission gear shifting rocker arm 10 are installed on the rotating shaft at one end of the main transmission control bracket welded part 23 through a universal joint structure. The main transmission gear selection pull rod assembly 11 and the main transmission gear shifting pull rod assembly 12. The two ends of the pull rod are respectively connected to the main transmission gear selection rocker arm 9 and the main transmission gear shifting rocker arm 10 by ball joint connectors at one end, and the other end is connected to the main transmission side control cover assembly of the chassis part.

[0065] The chassis part of the main transmission control mechanism includes: The main transmission control side cover 31 is installed on the side of the transmission housing 52. The main transmission control cover gear shifting rocker arm 13 is connected to the gear shifting lever 1 21 through a spline. A snap ring 1 33 is assembled on the gear shifting lever 1 21 to play a limiting role. The gear selection return spring 1 22 is installed on the gear shifting lever 1 21 to return the gear shifting lever 1 21. The main transmission control cover gear selection rocker arm 14 is fixed on the gear selection shaft 1 30 through an elastic cylindrical pin. The gear selection dial head 1 29 is fastened to the gear selection shaft 1 30 through a fastening screw 1 28. There is a slot on the gear shifting lever 1 21. The dial head of the gear selection dial head 1 29 is placed on the slot to drive the lever 1 21 to move axially. The 1-2 gear shift fork shaft 35 and the 3-4 gear shift fork shaft 36 are arranged longitudinally up and down. The 1-2 gear shift fork 20 is fixed on the 1-2 gear shift fork shaft 35 through an elastic cylindrical pin. The 3-4 gear shift fork 19 and the gear shifting block 1 39 are fixed on the 3-4 gear shift fork shaft 36 through an elastic cylindrical pin. The dial head of the gear shifting lever 1 21 is sleeved in the dial groove of the shift fork or the shift block. When the gear shifting lever 1 21 rotates, it can drive the shift fork or the shift block to move axially along the shift fork shaft. The end of the assembly is sealed with a seal 1 26 and a bowl-shaped plug 1 24.

[0066] The auxiliary transmission control mechanism is mainly divided into a chassis part (i.e., the auxiliary transmission chassis component, mainly a casting) and an assembly part (i.e., the auxiliary transmission assembly component, mainly bent rods). Both parts can be separately assembled.

[0067] The assembly part of the auxiliary transmission control mechanism includes: The auxiliary transmission control handle 25 is installed on the auxiliary transmission control lever 1. The auxiliary transmission gear selection rocker arm 2 and the auxiliary transmission gear shifting rocker arm 3 are installed on the other end of the rotating shaft of the auxiliary transmission control bracket welded part 58 through a universal joint structure. The auxiliary transmission gear selection pull rod assembly 4 and the auxiliary transmission gear shifting pull rod assembly 5. The two ends of the pull rod are respectively connected to the auxiliary transmission gear selection rocker arm 2 and the auxiliary transmission gear shifting rocker arm 3 by ball joint connectors at one end, and the other end is connected to the auxiliary transmission side control cover assembly of the chassis part.

[0068] The sub-speed shift control mechanism chassis part includes: The sub-speed shift control side cover 32 is installed on the side of the rear axle housing 53. The shift rocker arm 6 of the sub-speed shift control cover is connected to the second shift lever 16 through a spline. The second snap ring 44 is assembled on the second shift lever 16 to play a limiting role. The second shift return spring 46 is installed on the second shift lever 16 to return the second shift lever 16. The shift selector rocker arm 7 of the sub-speed shift control cover is fixed on the second shift selector shaft 42 through an elastic cylindrical pin. The second shift selector head 41 is fastened on the second shift selector shaft 42 through the second fastening screw 45. There is a slot on the second shift lever 16. The head of the second shift selector head 41 is placed on the slot to drive the second shift lever 16 to move axially. The medium-speed shift fork shaft 38 and the high-low speed shift fork shaft 37 are arranged longitudinally up and down. The medium-speed shift fork 18 is fixed on the medium-speed shift fork shaft 38 through an elastic cylindrical pin. The high-low speed shift fork 17 and the second shift block 40 are fixed on the high-low speed shift fork shaft 37 through elastic cylindrical pins. The head of the second shift lever 16 is sleeved in the shift groove of the shift fork or the shift head. When the second shift lever 16 rotates, it can drive the shift fork or the shift block to move axially along the shift fork shaft. The end of the assembly is sealed with the second oil seal 47 and the second bowl-shaped plug 48.

[0069] Function realization introduction: For the main speed shift, taking the movement direction towards the transmission housing as forward, the movement direction towards the rear axle housing as backward, the movement direction close to the transmission housing as left, and the movement direction away from the transmission housing as right, as Figures 1 to 13 :

[0070] 1st gear output: The main speed shift control handle 34 is moved to the right → The main speed shift selector rocker arm 9 rotates counterclockwise around the central axis ( Figure 2 ) → The main speed shift selector pull rod assembly 11 moves upward → The main speed shift control cover shift selector rocker arm 14 rotates clockwise around the first shift selector shaft 30 ( Figure 2 ) → The first shift selector head 29 rotates to the left around the first shift selector shaft 30 to move the first shift lever 21 inward, and the lever head is moved to the shift groove of the 1-2 shift fork 20 → The main speed shift control handle 34 is moved forward → The main speed shift rocker arm 10 rotates clockwise around the central axis ( Figure 3 ) → The main speed shift pull rod assembly 12 drives the main speed shift control cover shift rocker arm 13 to rotate counterclockwise around the first shift lever 21 ( Figure 3 ) → The head of the first shift lever 21 rotates counterclockwise synchronously ( Figure 3 ) to drive the 1-2 shift fork 20 to move forward to push the 1st gear to engage to realize the 1st gear output.

[0071] 2nd gear output: The main speed shift control handle 34 is moved to the right → The main speed shift selector rocker arm 9 rotates counterclockwise around the central axis ( Figure 2 ) → The main speed shift selector pull rod assembly 11 moves upward → The main speed shift control cover shift selector rocker arm 14 rotates clockwise around the first shift selector shaft 30 ( Figure 2) → The shift selector head 29 rotates counterclockwise around the shift selector shaft 30 to the left, moving the shift lever 21 inward. The lever head is moved to the groove of the 1-2 shift fork 20 → The main transmission control handle 34 moves backward → The main transmission shift rocker arm 10 rotates counterclockwise around the central axis ( Figure 3 ) → The main transmission shift rod assembly 12 drives the main transmission control cover shift rocker arm 13 to rotate clockwise around the shift lever 21 ( Figure 3 ) → The head of the shift lever 21 rotates clockwise synchronously ( Figure 3 ) drives the 1-2 shift fork 20 to move backward, pushing the 2nd gear to engage and realizing 2nd gear output.

[0072] 3rd gear output: The main transmission control handle 34 is moved to the left → The main transmission shift selector rocker arm 9 rotates clockwise around the central axis ( Figure 2 ) → The main transmission shift selector rod assembly 11 moves downward → The main transmission control cover shift selector rocker arm 14 rotates counterclockwise around the shift selector shaft 30 ( Figure 2 ) → The shift selector head 29 rotates clockwise around the shift selector shaft 30 to the right, moving the shift lever 21 outward. The lever head is moved to the groove of the shift block 39 → The main transmission control handle 34 moves forward → The main transmission shift rocker arm 10 rotates clockwise around the central axis ( Figure 3 ) → The main transmission shift rod assembly 12 drives the main transmission control cover shift rocker arm 13 to rotate counterclockwise around the shift lever 21 ( Figure 3 ) → The head of the shift lever 21 rotates counterclockwise synchronously ( Figure 3 ) drives the shift block 39 and the 3-4 shift fork 19 to move forward, pushing the 3rd gear to engage and realizing 3rd gear output.

[0073] 4th gear output: The main transmission control handle 34 is moved to the left → The main transmission shift selector rocker arm 9 rotates clockwise around the central axis ( Figure 2 ) → The main transmission shift selector rod assembly 11 moves downward → The main transmission control cover shift selector rocker arm 14 rotates counterclockwise around the shift selector shaft 30 ( Figure 2 ) → The shift selector head 29 rotates clockwise around the shift selector shaft 30 to the right, moving the shift lever 21 outward. The lever head is moved to the groove of the shift block 39 → The main transmission control handle 34 moves backward → The main transmission shift rocker arm 10 rotates counterclockwise around the central axis ( Figure 3 ) → The main transmission shift rod assembly 12 drives the main transmission control cover shift rocker arm 13 to rotate clockwise around the shift lever 21 ( Figure 3 ) → The head of the shift lever 21 rotates clockwise synchronously ( Figure 3 ) drives the shift block 39 and the 3-4 shift fork 19 to move backward, pushing the 4th gear to engage and realizing 4th gear output.

[0074] For the auxiliary transmission shift, with the direction towards the transmission housing as the front, the direction towards the rear axle housing as the rear, the direction towards the rear axle housing as the right, and the direction away from the rear axle housing as the left, asFigures 1 to 13 .

[0075] Low gear output: move the auxiliary speed control handle 25 to the right → rotate the auxiliary speed selector rocker arm 2 counterclockwise around the central axis ( Figure 8 ) → Auxiliary transmission gear selection lever assembly 4 moves downward → Auxiliary transmission operating cover gear selection rocker arm 7 rotates clockwise around gear selection shaft 2 42 ( Figure 8 ) → The gear selector head 241 rotates to the left around the gear selector shaft 242 to move the gear shift lever 216 outward, and the lever head moves to the gear shift block 240 slot → The auxiliary speed change operating handle 25 moves forward → The auxiliary speed change gear shift rocker arm 3 rotates counterclockwise around the center axis ( Figure 9 ) → The auxiliary transmission shift lever assembly 5 drives the auxiliary transmission operating cover shift rocker arm 6 to rotate clockwise around the shift lever 2 16 ( Figure 9 )→The shift lever 2 16's dial head rotates clockwise synchronously ( Figure 9 ) drives the shift block 2 40 and the high and low gear shift fork 17 to move forward to push the low gear to engage and realize low gear output.

[0076] High speed output: move the auxiliary speed control handle 25 to the right → rotate the auxiliary speed selector rocker arm 2 counterclockwise around the central axis ( Figure 8 ) → Auxiliary transmission gear selection lever assembly 4 moves downward → Auxiliary transmission operating cover gear selection rocker arm 7 rotates clockwise around gear selection shaft 2 42 ( Figure 8 ) → The gear selector head 241 rotates to the left around the gear selector shaft 242 to move the gear shift lever 216 outward, and the lever head moves to the gear shift block 240 slot → the auxiliary speed change operating handle 25 moves backward → the auxiliary speed change gear shift rocker arm 3 rotates clockwise around the center axis ( Figure 9 ) → The auxiliary transmission shift lever assembly 5 drives the auxiliary transmission operating cover shift rocker arm 6 to rotate counterclockwise around the shift lever 2 16 ( Figure 9 )→The shift lever 2 16's dial head rotates counterclockwise synchronously ( Figure 9 ) drives the shift block 2 40 and the high and low gear shift fork 17 to move backward to push the high gear to engage and realize high-grade output.

[0077] Mid-range output: Auxiliary speed control handle 25 moves to the left → auxiliary speed selection rocker arm 2 rotates clockwise around the central axis ( Figure 8 ) → Auxiliary transmission gear selection lever assembly 4 moves upward → Auxiliary transmission operating cover gear selection rocker arm 7 rotates counterclockwise around gear selection shaft 2 42 ( Figure 8 ) → The gear selector head 2 41 rotates to the right around the gear selector shaft 2 42 to move the gear shift lever 2 16 inward, and the lever head moves to the shift groove of the mid-range shift fork 18 → The auxiliary speed control handle 25 moves forward → The auxiliary speed shift rocker arm 3 rotates counterclockwise around the center axis ( Figure 9 ) → The auxiliary transmission shift lever assembly 5 drives the auxiliary transmission operating cover shift rocker arm 6 to rotate clockwise around the shift lever 2 16 ( Figure 9 )→The shift lever 2 16's dial head rotates clockwise synchronously (Figure 9 ) drives the mid-range shift fork 18 to move forward to push the mid-range gear to engage and realize mid-range output.

[0078] Creeper gear output: Auxiliary speed control handle 25 moves to the left → auxiliary speed selection rocker arm 2 rotates clockwise around the central axis ( Figure 8 ) → Auxiliary transmission gear selection lever assembly 4 moves upward → Auxiliary transmission operating cover gear selection rocker arm 7 rotates counterclockwise around gear selection shaft 2 42 ( Figure 8 ) → The gear selector head 2 41 rotates to the right around the gear selector shaft 2 42 to move the gear shift lever 2 16 inward, and the lever head is moved to the shift groove of the mid-range shift fork 18 → The auxiliary speed control handle 25 moves backward → The auxiliary speed shift rocker arm 3 rotates clockwise around the center axis ( Figure 9 ) → The auxiliary transmission shift lever assembly 5 drives the auxiliary transmission operating cover shift rocker arm 6 to rotate counterclockwise around the shift lever 2 16 ( Figure 9 )→The shift lever 2 16's dial head rotates counterclockwise synchronously ( Figure 9 ) drives the mid-range shift fork 18 to move backward to push the crawler gear to engage and realize the crawler gear output.

[0079] By arranging the main and auxiliary speed gears as described above, and combining them with the tractor's forward / reverse gears, a 4×4×2 shifting pattern can be implemented on the tractor side.

[0080] The aforementioned side-mounted control structure effectively solves the problem of large control space, which prevents the overall height and width of the machine from being reduced, preventing a flat floor design, and resulting in poor overall vehicle accessibility. The main and auxiliary speed control mechanisms are independent of each other, making installation and maintenance easier. The main and auxiliary speed control cover assemblies are located independently of the control levers, allowing for flexible lever placement based on ergonomic requirements, making shifting easier and providing greater operator comfort. The shift fork shaft is arranged longitudinally. The main and auxiliary speed control mechanisms are independent and side-mounted. The control levers and control cover assemblies are highly integrated and can be pre-assembled.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A variable speed control device, characterized in that, Comprising: a main speed change control mechanism (15), a sub-speed change control mechanism (27), a plurality of main speed change shift forks shafts (43), a plurality of sub-speed change shift forks shafts (49), a plurality of main speed change shift forks (50), a plurality of sub-speed change shift forks (51), a gearbox housing (52) and a rear axle housing (53), the gearbox housing (52) is connected to the rear axle housing (53), the main speed change control mechanism (15) is installed on the right side of the gearbox housing (52), the sub-speed change control mechanism (27) is installed on the left side of the rear axle housing (53), the plurality of main speed change shift forks shafts (43) are arranged longitudinally, the plurality of sub-speed change shift forks shafts (49) are arranged longitudinally, the plurality of main speed change shift forks (50) are respectively installed on the plurality of main speed change shift forks shafts (43), the plurality of sub-speed change shift forks (51) are respectively installed on the plurality of sub-speed change shift forks shafts (49), the main speed change control mechanism (15) is connected to the plurality of main speed change shift forks (50), and the sub-speed change control mechanism (27) is connected to the plurality of sub-speed change shift forks (51); The main speed change control mechanism (15) comprises: a main speed change general assembly component (54) having a gear selection control and a shift control function and a main speed change chassis component (55) having a gear selection and a shift function, the main speed change general assembly component (54) is connected to the main speed change chassis component (55), the main speed change general assembly component (54) is installed on the right side of the gearbox housing (52), and the main speed change chassis component (55) is connected to the plurality of main speed change shift forks (50); the sub-speed change control mechanism (27) comprises: a sub-speed change general assembly component (56) having a gear selection control and a shift control function and a sub-speed change chassis component (57) having a gear selection and a shift function, the sub-speed change general assembly component (56) is connected to the sub-speed change chassis component (57), the sub-speed change general assembly component (56) is installed on the left side of the rear axle housing (53), and the sub-speed change chassis component (57) is connected to the plurality of sub-speed change shift forks (51).

2. A speed change control device according to claim 1, characterized in that, The main transmission assembly component (54) includes: a main transmission control lever (8), a main transmission gear selection rocker arm (9), a main transmission shift rocker arm (10), a main transmission gear selection pull rod assembly (11), a main transmission shift pull rod assembly (12), and a main transmission control bracket welded assembly (23). The bottom of the main transmission control lever (8) is respectively connected to the main transmission gear selection rocker arm (9) and the main transmission shift rocker arm (10). The tops of the main transmission gear selection rocker arm (9) and the main transmission shift rocker arm (10) are rotatably mounted on the main transmission control bracket welded assembly (23). The main transmission control bracket welded assembly (23) is mounted on the transmission housing (52). The top of the main transmission gear selection pull rod assembly (11) is hinged to the bottom of the main transmission gear selection rocker arm (9). The top of the main transmission shift pull rod assembly (12) is hinged to the bottom of the main transmission shift rocker arm (10). The bottoms of the main transmission gear selection pull rod assembly (11) and the main transmission shift pull rod assembly (12) are both connected to the main transmission chassis component (55).

3. A variable speed control device according to claim 2, characterized in that, The main transmission gear selection rocker arm (9) is of an L-shaped structure. A main transmission control handle (34) is installed at the top of the main transmission control lever (8). The tops of the main transmission gear selection rocker arm (9) and the main transmission shift rocker arm (10) are rotatably mounted on the main transmission control bracket welded assembly (23) through universal joints. The top of the main transmission gear selection pull rod assembly (11) is hinged to the bottom of the main transmission gear selection rocker arm (9) through a ball joint. The top of the main transmission shift pull rod assembly (12) is hinged to the bottom of the main transmission shift rocker arm (10) through a ball joint.

4. A speed change control device according to claim 2, characterized in that, The main transmission chassis component (55) includes: a main transmission control cover shift rocker arm (13), a main transmission control cover gear selection rocker arm (14), a first shift lever (21), a first gear selection head (29), a first gear selection shaft (30), and a main transmission control side cover (31). The main transmission control side cover (31) is installed on the right side of the transmission housing (52). The top of the main transmission control cover shift rocker arm (13) is hinged to the bottom of the main transmission shift pull rod assembly (12). The first shift lever (21) is rotatably installed in the main transmission control side cover (31). The bottom of the main transmission control cover shift rocker arm (13) is connected to one end of the first shift lever (21). The first gear selection head (29) and the first gear selection shaft (30) are both installed in the main transmission control side cover (31). One end of the main transmission control cover gear selection rocker arm (14) is connected to the bottom of the main transmission gear selection pull rod assembly (11). The other end of the main transmission control cover gear selection rocker arm (14) is connected to the first gear selection shaft (30). The first gear selection head (29) is installed on the first gear selection shaft (30). The free end of the first gear selection head (29) is connected to the first shift lever (21). The multiple main transmission shift forks include: a 1-2 gear shift fork (20) and a 3-4 gear shift fork (19). The multiple main transmission shift fork shafts include: a 1-2 gear shift fork shaft (35) and a 3-4 gear shift fork shaft (36). The 1-2 gear shift fork shaft (35) and the 3-4 gear shift fork shaft (36) are arranged vertically up and down. The 1-2 gear shift fork (20) is installed on the 1-2 gear shift fork shaft (35). The 3-4 gear shift fork (19) is installed on the 3-4 gear shift fork shaft (36). A first shift block (39) is installed on the 3-4 gear shift fork shaft (36). The first shift block (39) is located between the 3-4 gear shift fork (19) and the 1-2 gear shift fork (20). The other end of the first shift lever (21) is connected to the 1-2 gear shift fork (20), the 3-4 gear shift fork (19), or the first shift block (39).

5. A speed change control device according to claim 4, characterized in that, A shift lever 1 (21) is sleeved with a shift selection return spring 1 (22) and a snap ring 1 (33). One end of the shift selection return spring 1 (22) abuts against the main transmission control side cover (31), and the other end of the shift selection return spring 1 (22) abuts against the other end of the shift lever 1 (21). One end of the snap ring 1 (33) abuts against one end of the shift lever 1 (21), and the other end of the snap ring 1 (33) abuts against the shift arm of the main transmission control cover (13). The bottom of the shift arm of the main transmission control cover (13) is connected to one end of the shift lever 1 (21) through a spline. The other end of the shift selection arm of the main transmission control cover (14) is connected to the shift selection shaft 1 (30) through an elastic cylindrical pin. The shift selection head 1 (29) is installed on the shift selection shaft 1 (30) through a fastening screw 1 (28). A clamping groove is formed in the middle of the shift lever 1 (21), and the free end of the shift selection head 1 (29) is installed in the clamping groove.

6. A speed change control device according to claim 1, characterized in that, The auxiliary transmission assembly component (56) includes: an auxiliary transmission control lever (1), an auxiliary transmission shift selection arm (2), an auxiliary transmission shift arm (3), an auxiliary transmission shift selection pull rod assembly (4), an auxiliary transmission shift pull rod assembly (5), and an auxiliary transmission control bracket welded assembly (58). The bottom of the auxiliary transmission control lever (1) is respectively connected to the auxiliary transmission shift selection arm (2) and the auxiliary transmission shift arm (3). The tops of the auxiliary transmission shift selection arm (2) and the auxiliary transmission shift arm (3) are rotatably installed on the auxiliary transmission control bracket welded assembly (58). The auxiliary transmission control bracket welded assembly (58) is installed on the rear axle housing (53). The top of the auxiliary transmission shift selection pull rod assembly (4) is hinged to the bottom of the auxiliary transmission shift selection arm (2). The top of the auxiliary transmission shift pull rod assembly (5) is hinged to the bottom of the auxiliary transmission shift arm (3). The bottoms of the auxiliary transmission shift selection pull rod assembly (4) and the auxiliary transmission shift pull rod assembly (5) are both connected to the auxiliary transmission chassis component (57).

7. A speed change control device according to claim 6, characterized in that, The auxiliary transmission shift selection arm (2) is of an L-shaped structure. An auxiliary transmission control handle (25) is installed at the top of the auxiliary transmission control lever (1). The tops of the auxiliary transmission shift selection arm (2) and the auxiliary transmission shift arm (3) are rotatably installed on the auxiliary transmission control bracket welded assembly (58) through universal joints. The top of the auxiliary transmission shift selection pull rod assembly (4) is hinged to the bottom of the auxiliary transmission shift selection arm (2) through a ball joint. The top of the auxiliary transmission shift pull rod assembly (5) is hinged to the bottom of the auxiliary transmission shift arm (3) through a ball joint.

8. A speed change control device according to claim 6, characterized in that, The auxiliary transmission chassis component (57) includes: an auxiliary transmission control cover shift rocker arm (6), an auxiliary transmission control cover shift selection rocker arm (7), a second shift lever (16), a second shift selection head (41), a second shift selection shaft (42), and an auxiliary transmission control side cover (32). The auxiliary transmission control side cover (32) is installed on the left side of the rear axle housing (53). The top of the auxiliary transmission control cover shift rocker arm (6) is hinged to the bottom of the auxiliary transmission shift pull rod assembly (5). The second shift lever (16) is rotatably installed in the auxiliary transmission control side cover (32). The bottom of the auxiliary transmission control cover shift rocker arm (6) is connected to one end of the second shift lever (16). The second shift selection head (41) and the second shift selection shaft (42) are both installed in the auxiliary transmission control side cover (32). One end of the auxiliary transmission control cover shift selection rocker arm (7) is connected to the bottom of the auxiliary transmission shift selection pull rod assembly (4). The other end of the auxiliary transmission control cover shift selection rocker arm (7) is connected to the second shift selection shaft (42). The second shift selection head (41) is installed on the second shift selection shaft (42). The free end of the second shift selection head (41) is connected to the second shift lever (16). The multiple auxiliary transmission shift forks (51) include: a middle gear shift fork (18) and a high / low gear shift fork (17). The multiple auxiliary transmission shift fork shafts (49) include: a middle gear shift fork shaft (38) and a high / low gear shift fork shaft (37). The middle gear shift fork shaft (38) and the high / low gear shift fork shaft (37) are arranged vertically up and down. The middle gear shift fork (18) is installed on the middle gear shift fork shaft (38). The high / low gear shift fork (17) is installed on the high / low gear shift fork shaft (37). A second shift block (40) is installed on the high / low gear shift fork shaft (37). The second shift block (40) is located between the middle gear shift fork (18) and the high / low gear shift fork (17). The other end of the second shift lever (16) is connected to the middle gear shift fork (18), the high / low gear shift fork (17), or the second shift block (40).

9. A speed change control device according to claim 8, characterized in that, A second shift selection return spring (46) and a second snap ring (44) are sleeved on the second shift lever (16). One end of the second shift selection return spring (46) abuts against the auxiliary transmission control side cover (32). The other end of the second shift selection return spring (46) abuts against the other end of the second shift lever (16). One end of the second snap ring (44) abuts against one end of the second shift lever (16). The other end of the second snap ring (44) abuts against the auxiliary transmission control cover shift rocker arm (6). The bottom of the auxiliary transmission control cover shift rocker arm (6) is connected to one end of the second shift lever (16) through a spline. The other end of the auxiliary transmission control cover shift selection rocker arm (7) is connected to the second shift selection shaft (42) through an elastic cylindrical pin. The second shift selection head (41) is installed on the second shift selection shaft (42) through a second fastening screw (45). A slot is formed in the middle of the second shift lever (16). The free end of the second shift selection head (41) is installed in the slot.

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