Agricultural vehicle transmission with belt and gear linkage and method

Abstract

The present invention relates to the technical field of transmissions, and in particular to a belt-gear-linked transmission for agricultural vehicles and a method thereof. The present invention comprises a main transmission connected to an engine, and an auxiliary transmission connected to the engine via a pulley, wherein the auxiliary transmission is mounted on the side of the main transmission and is linked to the main transmission for control, wherein the main transmission comprises a main first shaft, a main second shaft, a reverse shaft and an operating lever; the auxiliary transmission comprises an auxiliary first shaft, a power shaft, a shifting device and a bevel gear set. The present invention achieves the versatility and high efficiency of the transmission for agricultural vehicles through a combined main-auxiliary linkage; the main transmission is responsible for preliminary power transmission and speed control, while the auxiliary transmission provides high-precision shifting and power reversing functions; by optimizing the internal structure and layout of the transmission, the space utilization and transmission efficiency are improved, and the transmission is distributed in a triangular shape, which optimizes the internal space utilization of the transmission and reduces the volume and weight.

Description

Technical Field

[0001] The invention relates to the technical field of transmissions, and in particular to a belt-gear linked agricultural vehicle transmission and a method. Background Art

[0002] The traditional transmissions currently equipped in agricultural vehicles face problems such as insufficient shifting precision and easy failure due to aging. Despite this, it still retains the reverse gear function. Directly replacing such transmissions is not only costly, but also leads to a waste of resources. In response to this challenge, technicians have actively explored, such as the hydromechanical power shift transmission disclosed in Chinese patent CN111779814A, which is specially designed for high-horsepower agricultural vehicles and integrates the engine output shaft, independent PTO shaft, four-element hydraulic torque converter and multi-speed dual-clutch automatic transmission, showing innovative ideas. However, this solution still has limitations: it fails to make full use of the original transmission resources, and there are still deficiencies in functional diversity, shifting precision and space utilization, making it difficult to fully meet the urgent needs of modern agriculture for efficient and multi-functional agricultural vehicles. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a belt-gear linked agricultural vehicle transmission and method.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A belt-gear-linked transmission for agricultural vehicles, comprising a main transmission connected to an engine, and an auxiliary transmission connected to the engine through a pulley, wherein the auxiliary transmission is mounted on the side of the main transmission and is linked to the main transmission for control, wherein:

[0006] The main transmission includes a main first shaft, a main second shaft, a reverse shaft and an operating lever, wherein:

[0007] The main shaft 1 is connected to the engine output shaft and is provided with a gear set I, which is used to transmit the power of the operating lever to the main shaft 2;

[0008] The second main shaft is provided with a gear set II, which is used to transmit the power of the first main shaft to the reverse shaft;

[0009] The reverse gear shaft is provided with a gear set III, and a sealing ring is provided at the periphery of the gear set III for reverse gear control;

[0010] An operating lever, on which a shift fork is provided, which controls the combination of gear set I, gear set II and gear set III;

[0011] The auxiliary transmission comprises an auxiliary first shaft, a power shaft, a shifting device and a bevel gear set, wherein:

[0012] An auxiliary shaft, the end of which is provided with a mounting groove matching the main shaft;

[0013] The power shaft is connected to the engine through a pulley and is used to directly transmit power to the auxiliary shaft;

[0014] The gear shifting device includes a high-speed passive gear set, a high-speed and low-speed gear hub set and a low-speed passive gear set located on the auxiliary shaft, and a high-speed active gear set and a low-speed active gear set located on the power shaft, for realizing high-speed and low-speed gear shifting;

[0015] The bevel gear set meshes with the pulley shaft and the power shaft respectively to achieve power reversing.

[0016] This technical solution adds an auxiliary transmission to the original main transmission, and uses the main transmission to realize the gradual transmission of power and speed control through the main shaft, the second main shaft and the reverse shaft; the auxiliary transmission realizes the direct transmission of power, high and low gear switching and power reversing through the auxiliary shaft, the power shaft, the shifting device and the bevel gear set. Specifically, the auxiliary transmission is assembled on the side of the main transmission, realizing the effective use of space and the compactness of the structure; the mounting groove enables the auxiliary shaft to fit closely with the main shaft to ensure the stable transmission of power; the gear set, the shifting device and the bevel gear set are made of high-strength materials to ensure the durability of the transmission; the sealing ring ensures the sealing of the inside of the transmission to prevent the intrusion of impurities such as dust and moisture. In addition, the power output by the engine is transmitted to the gear set I through the main shaft, and the gear set I transmits the power to the gear set II on the main shaft, realizing the initial transmission of power inside the main transmission; the gear set II then transmits the power to the gear set III on the reverse shaft, and the reverse shaft controls the reverse gear function of the agricultural vehicle through the gear set III; the power of the engine is also transmitted to the power shaft through the pulley, and the power shaft transmits the power to the auxiliary shaft, and the auxiliary shaft cooperates with the main shaft through the installation groove to ensure the synchronous transmission of power; the shifting device inside the auxiliary transmission realizes the switching of high and low gears through the meshing of the high-gear active gear set, the low-gear active gear set and the corresponding high-gear passive gear set and low-gear passive gear set. In terms of the speed change principle, the operating lever controls the meshing state of the gear set I, the gear set II and the gear set III through the shift fork, thereby realizing the switching of different gears; the shifting device realizes the switching of high and low gears by changing the meshing state of the active gear set and the passive gear set; the bevel gear set realizes the reversing function of power by meshing the pulley shaft and the power shaft.

[0017] In addition, the above-mentioned belt-gear-linked agricultural vehicle transmission and method according to the present invention may also have the following additional technical features:

[0018] According to one embodiment of the present invention, the main transmission also includes a housing I, on which a shift assembly I is arranged, and the shift assembly I includes a gear shift fork shaft and a gear shift fork; the gear shift fork is arranged in the housing I through the gear shift fork shaft; the gear shift fork is used to push the gear set I to move, realize the double sliding from the first gear to the second gear, and move the gear set II, that is, the first gear driven gear set and the second gear driven gear set move on the main second shaft, thereby realizing the shifting of the first gear, the second gear and the reverse gear.

[0019] In this technical solution, the original main transmission has a certain shifting function, but its accuracy is not as good as the auxiliary transmission. It is used for shifting when the accuracy requirement is not high. The auxiliary transmission is used when the accuracy requirement is high. Specifically, the double sliding from the first gear to the second gear is achieved by pushing the gear fork. The gear set I contacts the driven gear sets of the first gear and the second gear at the same time and slides within a certain range to achieve a smooth transition of the gears; with the movement of the gear set I, the first gear driven gear set and the second gear driven gear set of the gear set II will also move on the main second shaft to achieve the switching of the gears.

[0020] According to one embodiment of the present invention, the auxiliary transmission also includes a housing II, on which a shift assembly II is arranged, and the shift assembly II includes a high and low gear shift fork shaft and a high and low gear shift fork; the high and low gear shift fork is slidably arranged in the housing II through the shift fork shaft; the high and low gear shift fork is used to push the high and low gear gear hub group to move, so that the high gear passive gear group and the low gear passive gear group move on the auxiliary shaft, thereby realizing the meshing of the high gear driving gear group and the high gear passive gear group or the meshing of the low gear driving gear group and the low gear passive gear group.

[0021] In this technical solution, when the desired gear is selected, the high and low gear shift fork shaft will slide accordingly, thereby driving the high and low gear shift forks to push the high and low gear gear hub groups to move, thereby realizing the gear switching; the high and low gear shift forks push the high and low gear gear hub groups to move, so that the high gear passive gear group and the low gear passive gear group move on the auxiliary shaft; as the high and low gear gear hub groups move, the high gear passive gear group or the low gear passive gear group will mesh with the corresponding high gear active gear group or the low gear active gear group; the entire shifting process is completed by operating the high and low gear shift fork shaft and the high and low gear shift forks. The shifting assembly II is located at the upper part of the housing II that is consistent with the power shaft height, and the auxiliary shaft is located at the lower part of the housing II.

[0022] According to one embodiment of the present invention, the bevel gear set includes an active bevel gear installed on the spline of the pulley shaft and a passive bevel gear installed on the power shaft; the input power of the pulley is reversed by meshing the active bevel gear with the passive bevel gear.

[0023] In this technical solution, the pulley shaft serves as the power input shaft, which transmits power to the active bevel gear installed thereon. The active bevel gear meshes with the passive bevel gear, and the axes of the active bevel gear and the passive bevel gear intersect at one point. When the active bevel gear rotates, the passive bevel gear rotates in the opposite direction. The power after reversing is transmitted to the power shaft through the passive bevel gear.

[0024] According to an embodiment of the present invention, the high gear driving gear set of the shifting device has 29 teeth and the high gear driven gear set has 20 teeth, which are used to make the transmission ratio smaller in the high gear position, thereby providing a higher vehicle speed;

[0025] The low-speed driving gear set has twenty-one teeth, and the low-speed passive gear set has twenty-nine teeth, which are used to make the transmission ratio larger in the low gear position, thereby providing a larger torque output.

[0026] This technical solution realizes the transmission of power and the conversion of torque through the meshing of active gears and passive gears with different numbers of teeth. Specifically, the transmission ratio of the high gear is 20 / 29. When the engine speed is constant, the wheel speed will be relatively high, thereby providing a higher vehicle speed. When agricultural vehicles need to travel at high speed, the high gear is a suitable choice; the transmission ratio of the low gear is 29 / 21. When the engine speed is constant, the wheel speed will be relatively low, but the torque will increase, thereby providing a larger torque output. When agricultural vehicles need a larger torque output, such as starting, accelerating or climbing, the low gear is a suitable choice.

[0027] According to one embodiment of the present invention, the gear sets of the main shaft, auxiliary shaft, main shaft two and power shaft are arranged in a triangular distribution, and the main shaft and auxiliary shaft are horizontally connected to realize the power transmission of the engine; the main shaft and main shaft two realize the switching of different gears, and the auxiliary shaft and the power shaft realize the switching of high and low gears, realizing stepless switching of different gears and high and low gears.

[0028] This technical solution optimizes space utilization and transmission efficiency through triangular distribution. Specifically, according to the overall size and layout requirements of the transmission, the positions of the main shaft, auxiliary shaft, main shaft and power shaft are determined to be as compact as possible to reduce the overall volume and weight of the transmission. The layout of the gear sets should follow the principle of triangular layout, that is, the center lines of each gear set should intersect at one point or approximately intersect at one point to form a triangular shape; the triangular distribution brings significant benefits to the transmission by optimizing space utilization, improving transmission efficiency, enhancing structural stability, providing maintenance convenience and design flexibility.

[0029] According to one embodiment of the present invention, a reverse gear assembly is also provided on the housing I, and the reverse gear assembly includes a reverse gear fork shaft and a reverse gear fork, and the reverse gear fork is arranged in the housing I through the reverse gear fork shaft; the reverse gear fork is used to push the gear group III, and the gear group III is provided with a reverse gear driven gear, and the reverse gear driven gear is meshed with the reverse gear transmission gear, and a sealing ring is provided on the periphery of the reverse gear sliding gear.

[0030] In this technical solution, when the driver selects reverse gear, the signal is transmitted to the reverse gear fork through the shift lever. After receiving the signal, the reverse gear fork will move along the reverse gear fork shaft, thereby pushing the reverse gear driven gear in gear group III to engage with the reverse gear transmission gear, thereby transmitting the power of the engine to the wheels, realizing reverse gear driving of the agricultural vehicle; the sealing ring ensures that the gear group III will not be affected by lubricating oil leakage during operation, and effectively prevents external impurities from entering the interior of the gear group III.

[0031] In order to achieve the above-mentioned purpose, the present invention also provides a belt-gear linked agricultural vehicle speed changing method.

[0032] A belt-gear-linked agricultural vehicle speed changing method comprises the following steps:

[0033] The engine output shaft rotates and transmits power through the main shaft of the directly connected main transmission; or receives power through the pulley, and the bevel gear set realizes 90-degree power reversal and transmits it indirectly to the auxiliary shaft through the power shaft, realizing the following different main and auxiliary speed change conditions:

[0034] Case 1: When the main transmission is shifting gears, the operating lever fork accurately controls the gear set to achieve double sliding shifting from the first gear to the second gear, as well as switching between the first gear and the second gear;

[0035] Case 2: When the main transmission is in reverse gear, the reverse gear function is realized by pushing the gear set III through the reverse gear fork;

[0036] Case 3: When the auxiliary transmission switches between high and low gears, the high and low gear shift forks push the gear hub assembly to move, achieving high or low gear engagement.

[0037] This technical solution realizes efficient and smooth speed change of agricultural vehicles under different working conditions through the direct or indirect transmission of the engine output shaft, the precise control of the operating lever fork, the pushing of the reverse gear fork, and the pushing of the high and low gear forks and the coordinated action of components. Specifically, the rotational power of the engine output shaft can be directly transmitted through the main shaft of the connected main transmission, or after receiving the power through the pulley, the power reversal of 90 degrees is realized through the bevel gear set, and then indirectly transmitted to the auxiliary shaft through the power shaft; through the precise control of the operating lever fork, the switching of the main transmission between different gears is realized, especially in the double sliding shifting process from the first gear to the second gear, and the switching between the first gear and the second gear, all benefit from the precise operation of the operating lever fork, ensuring the smooth and rapid shifting; through the pushing of the reverse gear fork, the function of the main transmission in reverse gear is realized. The reverse gear fork can accurately push the gear set III, so that the vehicle can smoothly perform the reverse operation; through the pushing of the high and low gear forks, the switching of the auxiliary transmission between high and low gears is realized. The high and low gear shift forks can push the gear hub assembly to move, thereby selectively achieving high gear or low gear engagement to meet the power requirements under different working conditions.

[0038] According to an embodiment of the present invention, in the second situation, when the main transmission is in reverse gear, the power is transmitted to the rear axle drive assembly through the meshing path of the gear set III to realize the reverse gear function.

[0039] According to an embodiment of the present invention, in the third situation, when the auxiliary transmission switches between high and low gears, the auxiliary shaft is connected to the shifting device through the coupling sleeve and is sequentially transmitted to the rear axle drive assembly to form a stable power output path.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] (1) The combined main and auxiliary transmissions achieve versatility and high efficiency. The main transmission is responsible for initial power transmission and speed control, while the auxiliary transmission provides high-precision shifting and power reversing functions. The two work together to enable agricultural vehicles to adapt to different working conditions and achieve efficient and smooth speed changes.

[0042] (2) By optimizing the internal structure and layout of the transmission, the space utilization and transmission efficiency are improved. The transmission is distributed in a triangular shape, which optimizes the space utilization inside the transmission and reduces the volume and weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a combination diagram of the main transmission and the auxiliary transmission.

[0044] Figure 2 It is a cross-sectional view of the main transmission and the auxiliary transmission.

[0045] Figure 3 It is a combination chart of the main axis and the auxiliary axis.

[0046] Figure 4 It is a cross-sectional view of the auxiliary axis.

[0047] Figure 5 It is a cross-sectional view of the power shaft.

[0048] In the figure: 1. main transmission; 11. main shaft 1; 12. main shaft 2; 13. reverse shaft; 14. operating lever; 15. shift fork; 16. gear set I; 17. gear set II; 18. gear set III; 2. auxiliary transmission; 21. auxiliary shaft 1; 22. power shaft; 23. high-speed passive gear set; 24. high- and low-speed gear hub set; 25. low-speed passive gear set; 26. high-speed driving gear set; 27. low-speed driving gear set; 28. bevel gear set. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] Example 1

[0051] like Figures 1 to 5 As shown, this embodiment provides a belt-gear-linked agricultural vehicle transmission, comprising a main transmission 1 connected to the engine, and an auxiliary transmission 2 connected to the engine through a pulley, the auxiliary transmission 2 being mounted on the side of the main transmission 1 and being linked to the main transmission 1 for control, wherein:

[0052] The main transmission 1 includes a main first shaft 11, a main second shaft 12, a reverse shaft 13 and an operating lever 14, wherein:

[0053] The first main shaft 11 is connected to the engine output shaft and is provided with a gear set I 16, which is used to transmit the power of the operating lever 14 to the second main shaft 12;

[0054] The second main shaft 12 is provided with a gear set II 17, which is used to transmit the power of the first main shaft 11 to the reverse shaft 13;

[0055] The reverse gear shaft 13 is provided with a gear set III 18, and a sealing ring is provided at the periphery of the gear set III 18 for reverse gear control;

[0056] An operating rod 14 on which a shift fork 15 is disposed, the shift fork 15 controls the combination of a gear set I 16, a gear set II 17 and a gear set III 18;

[0057] The auxiliary transmission 2 includes an auxiliary shaft 21, a power shaft 22, a shifting device and a bevel gear set 28, wherein:

[0058] The auxiliary shaft 21 has an end portion provided with a mounting groove that matches the main shaft 11;

[0059] The power shaft 22 is connected to the engine through a pulley and is used to directly transmit power to the auxiliary shaft 21;

[0060] The gear shifting device includes a high-speed passive gear set 23, a high-speed and low-speed gear hub set 24 and a low-speed passive gear set 25 located on the auxiliary shaft 21, and a high-speed driving gear set 26 and a low-speed driving gear set 27 located on the power shaft 22, for realizing high-speed and low-speed shifting;

[0061] The bevel gear set 28 is respectively engaged with the pulley shaft and the power shaft 22 to achieve power reversing.

[0062] like Figures 1 to 5As shown, the technical solution adds an auxiliary transmission 2 on the basis of the original main transmission 1, and uses the main transmission 1 to realize the gradual transmission of power and speed control through the main shaft 11, the second main shaft 12 and the reverse shaft 13; the auxiliary transmission 2 realizes the direct transmission of power, high and low gear switching and power reversing through the auxiliary shaft 21, the power shaft 22, the shifting device and the bevel gear set 28. Specifically, the auxiliary transmission 2 is assembled on the side of the main transmission 1, realizing the effective use of space and the compactness of the structure; the mounting groove enables the auxiliary shaft 21 to fit the main shaft 11 tightly to ensure the stable transmission of power; the gear set, the shifting device and the bevel gear set 28 are made of high-strength materials to ensure the durability of the transmission; the sealing ring ensures the sealing inside the transmission to prevent the intrusion of impurities such as dust and moisture. In addition, the power output by the engine is transmitted to the gear set I16 through the main shaft 11, and the gear set I16 transmits the power to the gear set II17 on the main shaft 12, thereby realizing the initial transmission of power inside the main transmission 1; the gear set II17 then transmits the power to the gear set III18 on the reverse shaft 13, and the reverse shaft 13 controls the reverse gear function of the agricultural vehicle through the gear set III18; the power of the engine is simultaneously transmitted to the power shaft 22 through the pulley, and the power shaft 22 transmits the power to the auxiliary shaft 21, and the auxiliary shaft 21 cooperates with the main shaft 11 through the mounting groove to ensure the synchronous transmission of power; the shifting device inside the auxiliary transmission 2 realizes the switching of high and low gears through the meshing of the high-gear driving gear set 26, the low-gear driving gear set 27 with the corresponding high-gear passive gear set 23, and the low-gear passive gear set 25. In terms of the speed change principle, the operating lever 14 controls the meshing state of the gear set I 16, the gear set II 17 and the gear set III 18 through the shift fork 15, thereby realizing the switching of different gears; the shifting device realizes the switching of high and low gears by changing the meshing state of the driving gear set and the driven gear set; the bevel gear set 28 realizes the power reversing function by meshing the pulley shaft and the power shaft 22.

[0063] In addition, the above-mentioned belt-gear-linked agricultural vehicle transmission and method according to the present invention may also have the following additional technical features:

[0064] According to one embodiment of the present invention, the main transmission 1 also includes a housing I, on which a shift assembly I is arranged, and the shift assembly I includes a gear shift fork shaft and a gear shift fork 15; the gear shift fork 15 is arranged in the housing I through the gear shift fork shaft; the gear shift fork 15 is used to push the gear set I 16 to move, realize the double sliding from the first gear to the second gear, and move the gear set II 17, that is, the first gear driven gear set and the second gear driven gear set move on the main second shaft 12, thereby realizing the shifting of the first gear, the second gear, and the reverse gear.

[0065] In this technical solution, the original main transmission 1 has a certain shifting function, but its accuracy is not as good as the auxiliary transmission 2. It is used for shifting when the accuracy requirement is not high. The auxiliary transmission 2 is used when the accuracy requirement is high. Specifically, the double sliding from the first gear to the second gear is achieved by pushing the gear fork 15. The gear set I 16 contacts the driven gear sets of the first gear and the second gear at the same time and slides within a certain range to achieve a smooth transition of the gears; with the movement of the gear set I 16, the first gear driven gear set and the second gear driven gear set of the gear set II 17 will also move on the main second shaft 12 to achieve the shifting of the gears.

[0066] According to one embodiment of the present invention, the auxiliary transmission 2 also includes a housing II, on which a shift assembly II is arranged, and the shift assembly II includes a high and low gear shift fork shaft and a high and low gear shift fork 15; the high and low gear shift fork 15 is slidably arranged in the housing II through the shift fork shaft; the high and low gear shift fork 15 is used to push the high and low gear gear hub set 24 to move, so that the high gear passive gear set 23 and the low gear passive gear set 25 move on the auxiliary shaft 21, thereby realizing the high gear driving gear set 26 to mesh with the high gear passive gear set 23 or the low gear driving gear set 27 to mesh with the low gear passive gear set 25.

[0067] In this technical solution, when the desired gear is selected, the high and low gear shift fork shaft will slide accordingly, thereby driving the high and low gear shift fork 15 to push the high and low gear gear hub set 24 to move, thereby realizing the gear switching; the high and low gear shift fork 15 pushes the high and low gear gear hub set 24 to move, so that the high gear passive gear set 23 and the low gear passive gear set 25 move on the auxiliary first shaft 21; with the movement of the high and low gear gear hub set 24, the high gear passive gear set 23 or the low gear passive gear set 25 will mesh with the corresponding high gear active gear set 26 or the low gear active gear set 27; the entire shifting process is completed by operating the high and low gear shift fork shaft and the high and low gear shift fork 15. The shifting assembly II is located at the upper part of the housing II that is in line with the height of the power shaft 22, and the auxiliary first shaft 21 is located at the lower part of the housing II.

[0068] According to an embodiment of the present invention, the bevel gear set 28 includes a driving bevel gear installed on the spline of the pulley shaft and a passive bevel gear installed on the power shaft 22; the input power of the pulley is reversed by meshing the driving bevel gear with the passive bevel gear.

[0069] In the present technical solution, the pulley shaft serves as the power input shaft, which transmits the power to the driving bevel gear installed thereon. The driving bevel gear meshes with the passive bevel gear, and the axes of the driving bevel gear and the passive bevel gear intersect at one point. When the driving bevel gear rotates, the passive bevel gear rotates in the opposite direction. The power after reversing is transmitted to the power shaft 22 through the passive bevel gear.

[0070] According to an embodiment of the present invention, the high gear driving gear set 26 of the shifting device has 29 teeth, and the high gear driven gear set 23 has 20 teeth, which are used to make the transmission ratio smaller in the high gear position, thereby providing a higher vehicle speed;

[0071] The low gear driving gear set 27 has 21 teeth, and the low gear driven gear set 25 has 29 teeth, which are used to make the transmission ratio larger in the low gear position, thereby providing a larger torque output.

[0072] This technical solution realizes the transmission of power and the conversion of torque through the meshing of active gears and passive gears with different numbers of teeth. Specifically, the transmission ratio of the high gear is 20 / 29. When the engine speed is constant, the wheel speed will be relatively high, thereby providing a higher vehicle speed. When agricultural vehicles need to travel at high speed, the high gear is a suitable choice; the transmission ratio of the low gear is 29 / 21. When the engine speed is constant, the wheel speed will be relatively low, but the torque will increase, thereby providing a larger torque output. When agricultural vehicles need a larger torque output, such as starting, accelerating or climbing, the low gear is a suitable choice.

[0073] According to one embodiment of the present invention, the gear sets of the main shaft 11, the auxiliary shaft 21, the second main shaft 12, and the power shaft 22 are arranged in a triangular distribution. The main shaft 11 is horizontally connected with the auxiliary shaft 21 to realize the power transmission of the engine; the main shaft 11 and the second main shaft 12 realize the switching of different gears, and the auxiliary shaft 21 and the power shaft 22 realize the switching of high and low gears, thereby realizing stepless switching of different gears and high and low gears.

[0074] This technical solution optimizes space utilization and transmission efficiency through triangular distribution. Specifically, according to the overall size and layout requirements of the transmission, the positions of the main shaft 11, the auxiliary shaft 21, the main shaft 12 and the power shaft 22 are determined to be as compact as possible to reduce the overall volume and weight of the transmission. The layout of the gear sets should follow the principle of triangular layout, that is, the center lines of each gear set should intersect at one point or approximately intersect at one point to form a triangular shape; the triangular distribution brings significant benefits to the transmission by optimizing space utilization, improving transmission efficiency, enhancing structural stability, providing maintenance convenience and design flexibility.

[0075] According to one embodiment of the present invention, a reverse gear assembly is also provided on the housing I, and the reverse gear assembly includes a reverse gear fork shaft and a reverse gear fork 15, and the reverse gear fork 15 is arranged in the housing I through the reverse gear fork shaft; the reverse gear fork 15 is used to push the gear group III 18, and the gear group III 18 is provided with a reverse gear driven gear, and the reverse gear driven gear is meshed with the reverse gear transmission gear, and a sealing ring is provided on the periphery of the reverse gear sliding gear.

[0076] In the present technical solution, when the driver selects reverse gear, the signal is transmitted to the reverse gear fork 15 through the shift lever. After receiving the signal, the reverse gear fork 15 moves along the reverse gear fork shaft, thereby pushing the reverse gear driven gear in the gear set III 18 to engage with the reverse gear transmission gear, thereby transmitting the power of the engine to the wheels, realizing reverse gear driving of the agricultural vehicle; the sealing ring ensures that the gear set III 18 will not be affected by lubricating oil leakage during operation, and effectively prevents external impurities from entering the interior of the gear set III 18.

[0077] Example 2

[0078] Based on Example 1, Figures 1 to 5 As shown, this embodiment provides a belt-gear-linked agricultural vehicle speed changing method, comprising the following steps:

[0079] The engine output shaft rotates and transmits power through the main shaft 11 of the directly connected main transmission 1; or receives power through the pulley, realizes 90-degree power reversal by the bevel gear set 28, and indirectly transmits power to the auxiliary shaft 21 through the power shaft 22, realizing the following different main and auxiliary speed change conditions:

[0080] Case 1: When the main transmission 1 is shifting gears, the operating lever 14 and the shift fork 15 accurately control the gear set to achieve double sliding shifting from the first gear to the second gear, and switching between the first gear and the second gear;

[0081] Case 2: When the main transmission 1 is in reverse gear, the reverse gear fork 15 pushes the gear set III 18 to realize the reverse gear function;

[0082] Case 3: When the auxiliary transmission 2 switches between high and low gears, the high and low gear shift forks 15 push the gear hub assembly to move, thereby achieving high gear or low gear engagement.

[0083] This technical solution realizes efficient and smooth speed change of agricultural vehicles under different working conditions through the direct or indirect transmission of the engine output shaft, the precise control of the operating lever 14 fork 15, the pushing of the reverse gear fork 15, and the pushing of the high and low gear forks 15 and the coordinated action of the components. Specifically, the rotational power of the engine output shaft can be directly transmitted through the main shaft 11 of the connected main transmission 1, or after receiving the power through the pulley, the power reversal of 90 degrees is realized through the bevel gear set 28, and then indirectly transmitted to the auxiliary shaft 21 through the power shaft 22; through the precise control of the operating lever 14 fork 15, the switching of the main transmission 1 between different gears is realized, especially in the double sliding shifting process from the first gear to the second gear, and the switching between the first gear and the second gear, all benefit from the precise operation of the operating lever 14 fork 15, ensuring the smooth and rapid shifting; through the pushing of the reverse gear fork 15, the function of the main transmission 1 in reverse gear is realized. The reverse gear shift fork 15 can accurately push the gear set III 18, so that the vehicle can smoothly reverse; the auxiliary transmission 2 is switched between high and low gears by pushing the high and low gear shift fork 15. The high and low gear shift fork 15 can push the gear hub set to move, thereby selectively realizing the engagement of high gear or low gear to meet the power requirements under different working conditions.

[0084] According to an embodiment of the present invention, in the second situation, when the main transmission 1 is in reverse gear, the power is transmitted to the rear axle drive assembly through the meshing path of the gear set III 18 to realize the reverse gear function.

[0085] According to an embodiment of the present invention, in the third situation, when the auxiliary transmission 2 switches between high and low gears, the auxiliary shaft 21 is connected to the shifting device through the coupling sleeve and is sequentially transmitted to the rear axle drive assembly to form a stable power output path.

[0086] Although the present invention has been described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person of ordinary skill in the art may easily think of changes or substitutions within the technical scope disclosed by the present invention, and these shall be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A belt-gear-linked agricultural vehicle transmission, characterized in that: It includes a main transmission connected to the engine, and an auxiliary transmission connected to the engine through a pulley. The auxiliary transmission is mounted on the side of the main transmission and is linked to the main transmission for control, wherein: The main transmission includes a main first shaft, a main second shaft, a reverse shaft and an operating lever, wherein: The main shaft 1 is connected to the engine output shaft and is provided with a gear set I, which is used to transmit the power of the operating lever to the main shaft 2; The second main shaft is provided with a gear set II, which is used to transmit the power of the first main shaft to the reverse shaft; The reverse gear shaft is provided with a gear set III, and a sealing ring is provided at the periphery of the gear set III for reverse gear control; An operating lever, on which a shift fork is provided, which controls the combination of gear set I, gear set II and gear set III; The auxiliary transmission comprises an auxiliary first shaft, a power shaft, a shifting device and a bevel gear set, wherein: An auxiliary shaft, the end of which is provided with a mounting groove matching the main shaft; The power shaft is connected to the engine through a pulley and is used to directly transmit power to the auxiliary shaft; The gear shifting device includes a high-speed passive gear set, a high-speed and low-speed gear hub set and a low-speed passive gear set located on the auxiliary shaft, and a high-speed active gear set and a low-speed active gear set located on the power shaft, for realizing high-speed and low-speed gear shifting; The bevel gear set meshes with the pulley shaft and the power shaft respectively to achieve power reversing.

2. The belt-gear-linked agricultural vehicle transmission according to claim 1, characterized in that: The bevel gear set comprises a driving bevel gear installed on the spline of the pulley shaft and a passive bevel gear installed on the power shaft; the reversal of the pulley input power is achieved through the meshing of the driving bevel gear and the passive bevel gear.

3. The belt-gear-linked agricultural vehicle transmission according to claim 1, characterized in that: The high gear driving gear set of the shifting device has 29 teeth, and the high gear driven gear set has 20 teeth, which are used to make the transmission ratio smaller in the high gear position, thereby providing a higher vehicle speed; The low-speed driving gear set has twenty-one teeth, and the low-speed passive gear set has twenty-nine teeth, which are used to make the transmission ratio larger in the low gear position, thereby providing a larger torque output.

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