Tractor stepless speed change transmission system

Abstract

The invention relates to the technical field of agricultural mechanical equipment, in particular to a tractor stepless speed change transmission system which comprises an engine, a clutch is arranged at the output end of the engine, a first front speed increasing box is arranged at the output end of the clutch, a first hydrostatic stepless speed changer is arranged at the output end of the first front speed increasing box, and a second hydrostatic stepless speed changer is arranged at the output end of the second front speed increasing box. A gearbox assembly, a middle power output assembly and a rear power output assembly are arranged at the output end of the first hydrostatic continuously variable transmission, and a rear axle assembly and a front drive axle assembly are arranged at the output end of the gearbox assembly. By arranging the first front speed increasing box and the first hydrostatic continuously variable transmission, the first front speed increasing box achieves power speed increasing through gear meshing transmission, the structure is compact, the transmission efficiency is high, power input with the higher rotating speed can be provided for follow-up transmission parts, and the power transmission performance of the whole transmission system is optimized; the first hydrostatic stepless speed changer can flexibly adjust the angle of an internal swash plate according to operation requirements, and stepless speed change is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural machinery and equipment, and particularly relates to a continuously variable transmission system for a tractor. Background Art

[0002] The transmission system of a tractor is a mechanical device assembly that connects the engine and the drive wheels, transmits and adjusts the power generated by the engine as needed, and realizes functions such as the forward, reverse, speed change, and differential steering of the tractor.

[0003] However, the power transmission components of the traditional tractor transmission system have an insufficiently compact structure and low transmission efficiency, making it difficult to provide high-speed power input to optimize the overall performance. Secondly, the speed change function of the traditional tractor transmission system is severely limited, with a large speed span and unable to achieve continuously variable transmission, making it difficult to adapt to complex working conditions. At the same time, the uneven speed change will also affect the driving comfort. In addition, when the traditional tractor transmission system transmits power to the middle and rear equipment, it cannot flexibly connect or disconnect the power transmission according to the actual operation situation, making it difficult to meet the diverse power requirements and prone to power waste. Summary of the Invention

[0004] The purpose of the present invention is to provide a continuously variable transmission system for a tractor to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: It includes an engine, a clutch is arranged at the output end of the engine, a first front speed increasing box is arranged at the output end of the clutch, a first hydrostatic continuously variable transmission is arranged at the output end of the first front speed increasing box, a transmission assembly, a middle power output component, and a rear power output component are arranged at the output end of the first hydrostatic continuously variable transmission, and a rear axle assembly and a front drive axle component are arranged at the output end of the transmission assembly; A hydrostatic continuously variable transmission input shaft is arranged inside the first hydrostatic continuously variable transmission, and an output shaft one and an output shaft two are arranged on the side of the first hydrostatic continuously variable transmission away from the hydrostatic continuously variable transmission input shaft; A front speed increasing box input shaft is arranged inside the first front speed increasing box, the front speed increasing box input shaft is connected to the output end of the clutch, a front input gear is sleeved on the front speed increasing box input shaft, a front speed increasing box intermediate shaft is arranged on one side of the front speed increasing box input shaft, and a front intermediate gear meshing with the front input gear is sleeved on the front speed increasing box intermediate shaft; The transmission assembly includes a transmission assembly input shaft, a spline sleeve is arranged between the transmission assembly input shaft and the output shaft two, a middle gear driving gear is sleeved on the transmission assembly input shaft, a first meshing tooth seat is arranged on the transmission assembly input shaft on the side of the middle gear driving gear, and a first engaging sleeve is sleeved outside the first meshing tooth seat.

[0006] Preferably, on the side of the intermediate shaft of the front speed increasing box away from the input shaft of the front speed increasing box, there is an output shaft of the front speed increasing box. A spline sleeve is arranged between the input shaft of the hydrostatic continuously variable transmission and the output shaft of the front speed increasing box. An output gear meshing with the front intermediate gear is sleeved on the output shaft of the front speed increasing box.

[0007] Preferably, a high-speed gear driving gear is sleeved on the input shaft of the transmission assembly on the side of the intermediate gear driving gear away from the engagement sleeve, and a low-speed gear driving gear is sleeved on the input shaft of the transmission assembly on the side of the high-speed gear driving gear away from the intermediate gear driving gear.

[0008] Preferably, on one side of the input shaft of the transmission assembly, there is an output shaft of the transmission assembly. A middle-speed gear driven gear meshing with the middle-speed gear driving gear is sleeved on the output shaft of the transmission assembly. A high-speed gear driven gear meshing with the high-speed gear driving gear is sleeved on the output shaft of the transmission assembly. A low-speed gear driven gear meshing with the low-speed gear driving gear is sleeved on the output shaft of the transmission assembly. On the output shaft of the transmission assembly between the high-speed gear driven gear and the low-speed gear driven gear, there is a second engagement tooth seat, and a second engagement sleeve is sleeved outside the second engagement tooth seat.

[0009] Preferably, the rear axle assembly includes a first rear differential. A rear differential input shaft is arranged on the first rear differential. The rear differential input shaft is connected to the output shaft of the transmission assembly. A first central driving bevel gear is sleeved on the rear differential input shaft. A rear differential output shaft is arranged in the middle of the first rear differential. A first central driven bevel gear meshing with the first central driving bevel gear is sleeved on the rear differential output shaft. A differential lock is arranged on the side of the rear differential output shaft away from the first central driven bevel gear.

[0010] Preferably, a pair of first final driving gears are symmetrically sleeved on both sides of the rear differential output shaft. Brakes are arranged on one side of both of the first final driving gears. A pair of rear wheel drive shafts are arranged on one side of the first rear differential. A first final driven gear meshing with the first final driving gear is sleeved on each of the rear wheel drive shafts. Tractor rear wheels are arranged at one end of each of the rear wheel drive shafts.

[0011] Preferably, the rear power output assembly includes a rear power input shaft. A rear power output driving gear is sleeved on the rear power input shaft. A rear power output shaft is arranged on one side of the rear power input shaft. A rear power output driven gear meshing with the rear power output driving gear is sleeved on the rear power output shaft.

[0012] Preferably, in the present invention, the central power output assembly includes a central power output driving gear one sleeved on the first output shaft. On one side of the first output shaft, there is a central power intermediate shaft. A central power output intermediate gear one meshing with the central power output driving gear one is sleeved on the central power intermediate shaft. A central power output intermediate gear two is sleeved on the central power intermediate shaft on one side of the central power output intermediate gear one. On one side of the central power intermediate shaft, there is a first central power output shaft. A spline sleeve is provided between the first central power output shaft and the rear power input shaft. A central power output driven gear one meshing with the central power output intermediate gear two is sleeved on the first central power output shaft. On the first central power output shaft on one side of the central power output driven gear one, there is a meshing tooth seat three. An engaging sleeve three is sleeved outside the meshing tooth seat three. A central power output driving gear two is sleeved on the first central power output shaft on the side of the engaging sleeve three away from the central power output driven gear one. On one side of the first central power output shaft, there is a central power output intermediate shaft. A central power output intermediate gear three meshing with the central power output driving gear two is sleeved on the central power output intermediate shaft. On the side of the central power output intermediate shaft away from the first central power output shaft, there is a second central power output shaft. A central power output driven gear two meshing with the central power output intermediate gear three is sleeved on the second central power output shaft.

[0013] Preferably, in the present invention, the front drive axle assembly includes a front drive active gear provided on the output shaft of the transmission assembly. On one side of the output shaft of the transmission assembly, there is a front drive axle input shaft. A front drive passive gear meshing with the front drive active gear is sleeved on the front drive axle input shaft. On one side of the front drive passive gear, there is a first front differential. On one side of the first front differential, there is a front differential input shaft. A universal joint is provided between the front differential input shaft and the front drive axle input shaft. A central drive active bevel gear two is sleeved on the front differential input shaft. In the middle of the first front differential, there is a front differential output shaft. On one side of the front differential output shaft, a central drive passive bevel gear two meshing with the central drive active bevel gear two is sleeved. A pair of final drive active bevel gears two are symmetrically sleeved on both sides of the front differential output shaft. On both sides of the front differential output shaft, there is a first transmission shaft. A pair of final drive intermediate bevel gears are symmetrically sleeved on each of the two first transmission shafts. The right final drive intermediate bevel gear meshes with the final drive active bevel gear two. On one side of each of the two first transmission shafts, there is a front wheel transmission shaft. A final drive passive bevel gear two is sleeved on each of the two front wheel transmission shafts. The left final drive intermediate bevel gear meshes with the final drive passive bevel gear two. At one end of each of the two front wheel transmission shafts, there is a tractor front wheel.

[0014] Compared with the prior art, the above technical solution of the present invention has the following beneficial technical effects: 1. The present invention provides a front speed increasing box and a hydrostatic continuously variable transmission. Firstly, the front speed increasing box realizes power increasing through gear meshing transmission, has a compact structure and high transmission efficiency, can provide higher speed power input for subsequent transmission components, and optimizes the power transmission performance of the entire transmission system. Secondly, the hydrostatic continuously variable transmission can flexibly adjust the internal swash plate angle according to operating requirements to realize stepless speed change, so that the tractor can adapt to a variety of complex working conditions, improves the adaptability and work efficiency of the tractor in different operating scenarios, and at the same time, its smooth speed change characteristics also help to improve driving comfort.

[0015] 2. The present invention is provided with a transmission assembly, a rear axle assembly and a front drive axle assembly. First, the output shaft 2 is connected with the input shaft of the transmission assembly through a spline sleeve, and the power is introduced from the output shaft 2. Because the transmission assembly has multiple gears, a variety of speed change and direction change functions can be achieved through the engagement of the engagement sleeve with gears of different gears, so as to meet the power requirements of the tractor under different operating speeds and load conditions, and enhance the operating flexibility and power matching of the tractor. Secondly, the rear axle assembly outputs the power transmitted by the output shaft of the transmission assembly to the rear wheel of the tractor, drives the rear wheel of the tractor to rotate, and realizes the movement of the tractor. At the same time, the rear axle assembly realizes the differential rotation of the left and right rear wheels through the differential, adapts to the speed difference when the tractor turns, and ensures the driving stability. The differential lock can lock the left and right rear wheels when the vehicle is stuck, and enhances the ability to escape from difficulties. The brake ensures the driving safety. In addition, the front drive axle assembly transmits the power transmitted by the output shaft of the transmission assembly to the front wheel of the tractor, and realizes the four-wheel drive of the tractor, which improves the passability and traction of the tractor under complex road conditions, and ensures that the tractor can run stably and efficiently in various operating environments.

[0016] 3. The present invention sets a rear power output assembly and a mid-position power output assembly. First, the mid-position power output assembly adopts a multi-stage gear transmission structure to introduce power from the output shaft 1, and uses a meshing sleeve to realize the connection and disconnection of the power transmission path. When the meshing sleeve 3 is engaged with the mid-position power output passive gear 1, the power transmission paths in the mid-position power output assembly and the rear power output assembly can be connected to transmit power to the middle and rear equipment of the tractor, which not only ensures the accuracy of the power supply to the middle and rear equipment, but also provides a flexible interface for power transmission. Secondly, the rear power output assembly directly transmits power from the mid-position power output shaft 1 to the rear equipment of the tractor, providing stable and efficient power support for the rear operating device, and significantly improving the efficiency and quality of the rear operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2is Figure 1 Enlarged schematic view of position A in Figure 3 is Figure 1 Enlarged schematic view of position B in Figure 4 is Figure 1 Enlarged schematic view of position C in Figure 5 is Figure 1 Enlarged schematic view of position D in Figure 6 is Figure 1 Enlarged schematic view of position E in

[0018] Reference numerals: Engine 1, Clutch 2, Front speed increasing gearbox I 3, Front speed increasing gearbox input shaft 31, Front input gear 32, Front speed increasing gearbox intermediate shaft 33, Front intermediate gear 34, Front speed increasing gearbox output shaft 35, Front output gear 36, Hydrostatic continuously variable transmission I 4, Hydrostatic continuously variable transmission input shaft 41, Output shaft I 42, Output shaft II 43, Transmission assembly 5, Transmission assembly input shaft 51, Medium gear driving gear 52, Engagement tooth seat I 53, Engagement sleeve I 54, High gear driving gear 55, Low gear driving gear 56, Transmission assembly output shaft 57, Medium gear driven gear 58, High gear driven gear 59, Low gear driven gear 510, Engagement tooth seat II 511, Engagement sleeve II 512, Rear axle assembly 6, Rear differential I 61, Rear differential input shaft 62, Central drive driving bevel gear I 63, Rear differential output shaft 64, Central drive driven bevel gear I 65, Differential lock 66, Final drive driving gear I 67, Brake 68, Rear wheel transmission shaft 69, Final drive driven gear I 610, Tractor rear wheel 611, Rear power take-off assembly 7, Rear power input shaft 71, Rear power take-off driving gear 72, Rear power take-off shaft 73, Rear power take-off driven gear 74, Middle power take-off assembly 8, Middle power take-off driving gear I 81, Middle power take-off intermediate shaft 82, Middle power take-off intermediate gear I 83, Middle power take-off intermediate gear II 84, Middle power take-off shaft I 85, Middle power take-off driven gear I 86, Engagement tooth seat III 87, Engagement sleeve III 88, Middle power take-off driving gear II 89, Middle power take-off intermediate shaft 810, Middle power take-off intermediate gear III 811, Middle power take-off shaft II 812, Middle power take-off driven gear II 813, Front drive axle assembly 9, Front drive gear 91, Front drive axle input shaft 92, Front driven gear 93, Universal joint 94, Front differential I 95, Front differential input shaft 96, Central drive driving bevel gear II 97, Front differential output shaft 98, Central drive driven bevel gear II 99, Final drive driving bevel gear II 910, Transmission shaft I 911, Final drive intermediate bevel gear 912, Front wheel transmission shaft 913, Final drive driven bevel gear II 914, Tractor front wheel 915. Detailed implementation mode

[0019] To make the objectives, technical solutions and advantages of the present invention clearer and more explicit, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0020] As Figures 1-6 shown, a continuously variable transmission system for a tractor proposed by the present invention includes an engine 1, which provides the power required for the operation of the tractor. A clutch 2 is provided at the output end of the engine 1, and the clutch 2 controls the engagement and separation of the power from the engine 1 to the subsequent transmission components. A first front speed increasing box 3 is provided at the output end of the clutch 2, and a first hydrostatic continuously variable transmission 4 is provided at the output end of the first front speed increasing box 3. A transmission assembly 5, a mid-mounted power output assembly 8 and a rear-mounted power output assembly 7 are provided at the output end of the first hydrostatic continuously variable transmission 4. A rear axle assembly 6 and a front drive axle assembly 9 are provided at the output end of the transmission assembly 5; A hydrostatic continuously variable transmission input shaft 41 is provided inside the first hydrostatic continuously variable transmission 4. An output shaft 42 and an output shaft 43 are provided on the side of the first hydrostatic continuously variable transmission 4 away from the hydrostatic continuously variable transmission input shaft 41. The output shaft 42 outputs the speed-varied power, which is mainly supplied to the mid-mounted power output assembly 8, and the output shaft 43 outputs the speed-varied power, which is mainly supplied to the transmission assembly 5; A front speed increasing box input shaft 31 is provided inside the first front speed increasing box 3. The front speed increasing box input shaft 31 is connected to the output end of the clutch 2, and the front speed increasing box input shaft 31 receives the power input from the clutch 2. A front input gear 32 is sleeved on the front speed increasing box input shaft 31, and the front input gear 32 transmits the power from the front speed increasing box input shaft 31 to the front speed increasing box intermediate shaft 33. A front speed increasing box intermediate shaft 33 is provided on one side of the front speed increasing box input shaft 31. A front intermediate gear 34 meshing with the front input gear 32 is sleeved on the front speed increasing box intermediate shaft 33. The front speed increasing box intermediate shaft 33 and the front intermediate gear 34 serve as intermediate links for power transmission, connecting the front input gear 32 and the front output gear 36; The transmission assembly 5 includes an input shaft 51 of the transmission assembly. A spline sleeve is provided between the input shaft 51 of the transmission assembly and the second output shaft 43. The input shaft 51 of the transmission assembly receives the power input from the first hydrostatic continuously variable transmission 4. A medium-speed driving gear 52 is sleeved on the input shaft 51 of the transmission assembly. When shifting into the medium speed, the medium-speed driving gear 52 transmits the power to the medium-speed driven gear 58. An engaging tooth seat 53 is provided on the input shaft 51 of the transmission assembly on one side of the medium-speed driving gear 52. An engaging sleeve 54 is sleeved outside the engaging tooth seat 53. The engaging tooth seat 53 provides a tooth seat for the engaging sleeve 54 to combine, realizing the selection of gears. The engaging sleeve 54 is engaged with the medium-speed driving gear 52 by sliding to realize gear shifting.

[0021] A front speed increasing box output shaft 35 is provided on the side of the intermediate shaft 33 of the front speed increasing box away from the input shaft 31 of the front speed increasing box. A spline sleeve is provided between the input shaft 41 of the hydrostatic continuously variable transmission and the front speed increasing box output shaft 35. The input shaft 41 of the hydrostatic continuously variable transmission receives the power input from the front speed increasing box output shaft 35. A front output gear 36 meshing with the front intermediate gear 34 is sleeved on the front speed increasing box output shaft 35. The front output gear 36 transmits the power from the intermediate shaft 33 of the front speed increasing box to the front speed increasing box output shaft 35, and the front speed increasing box output shaft 35 outputs the increased-speed power.

[0022] A high-speed driving gear 55 is sleeved on the input shaft 51 of the transmission assembly on the side of the medium-speed driving gear 52 away from the engaging sleeve 54. When shifting into the high speed, the high-speed driving gear 55 transmits the power to the high-speed driven gear 59. A low-speed driving gear 56 is sleeved on the input shaft 51 of the transmission assembly on the side of the high-speed driving gear 55 away from the medium-speed driving gear 52. When shifting into the low speed, the low-speed driving gear 56 transmits the power to the low-speed driven gear 510.

[0023] A gearbox assembly output shaft 57 is provided on one side of the gearbox assembly input shaft 51. The gearbox assembly output shaft 57 outputs the power after the speed change and supplies it to the rear axle assembly 6 and the front drive axle assembly 9. A middle gear driven gear 58 meshing with the middle gear driving gear 52 is sleeved on the gearbox assembly output shaft 57. The middle gear driven gear 58 meshes with the middle gear driving gear 52 to transmit the middle gear power. A high gear driven gear 59 meshing with the high gear driving gear 55 is sleeved on the gearbox assembly output shaft 57. The high gear driven gear 59 meshes with the high gear driving gear 55 to transmit the high gear power. The gearbox assembly output shaft 57 is provided with a gearbox assembly output shaft 57. A low-gear passive gear 510 meshing with the low-gear driving gear 56 is sleeved on the shaft 57. The low-gear passive gear 510 meshes with the low-gear driving gear 56 to transmit low-gear power. A meshing gear seat 2 511 is provided on the output shaft 57 of the transmission assembly between the high-gear passive gear 59 and the low-gear passive gear 510. A meshing sleeve 2 512 is sleeved on the outer side of the meshing gear seat 2 511. The meshing gear seat 2 511 provides a combined gear seat for the meshing sleeve 2 512 to achieve gear selection. The meshing sleeve 2 512 is combined with the high-gear passive gear 59 or the low-gear passive gear 510 by sliding to achieve gear switching.

[0024] The rear axle assembly 6 includes a rear differential 61, which allows the left and right rear wheels to rotate at different speeds to adapt to the speed difference when turning. The rear differential 61 is provided with a rear differential input shaft 62, which is connected to the gearbox assembly output shaft 57, and receives power input from the gearbox assembly output shaft 57. The rear differential input shaft 62 is sleeved with a central transmission active bevel gear 63. The rear differential output shaft 62 is provided in the middle of the rear differential 61. Output shaft 64, the rear differential output shaft 64 is sleeved with a central transmission passive bevel gear 65 meshing with the central transmission active bevel gear 63, the central transmission active bevel gear 63 cooperates with the central transmission passive bevel gear 65 to transmit power from the rear differential input shaft 62 to the rear differential output shaft 64, and a differential lock 66 is provided on the side of the rear differential output shaft 64 away from the central transmission passive bevel gear 65. When the tractor is stuck, the differential lock 66 locks the left and right rear wheels to increase the ability to escape.

[0025] On both sides of the rear differential output shaft 64, a pair of first final drive drive gears 67 are symmetrically sleeved. The rear differential output shaft 64 outputs power to the first final drive drive gears 67. On one side of each of the two first final drive drive gears 67, a brake 68 is provided. The brake 68 realizes the deceleration or stopping of the tractor. On one side of the first rear differential 61, a pair of rear wheel drive shafts 69 are provided. On each of the two rear wheel drive shafts 69, a first final drive driven gear 610 meshing with the first final drive drive gear 67 is sleeved. The first final drive drive gear 67 and the first final drive driven gear 610 cooperate to transmit the power from the rear differential output shaft 64 to the rear wheel drive shafts 69. At one end of each of the two rear wheel drive shafts 69, a tractor rear wheel 611 is provided. The rear wheel drive shaft 69 outputs power to the tractor rear wheel 611 to drive the tractor rear wheel 611 to rotate, realizing the movement of the tractor.

[0026] The rear power output assembly 7 includes a rear power input shaft 71. The rear power input shaft 71 receives the power input from the first mid-power output shaft 85. A rear power output drive gear 72 is sleeved on the rear power input shaft 71. On one side of the rear power input shaft 71, a rear power output shaft 73 is provided. A rear power output driven gear 74 meshing with the rear power output drive gear 72 is sleeved on the rear power output shaft 73. The rear power output drive gear 72 and the rear power output driven gear 74 cooperate to transmit the power from the rear power input shaft 71 to the rear power output shaft 73, thereby transmitting the power to the equipment at the rear of the tractor.

[0027] The mid-power output assembly 8 includes a first mid-power output drive gear 81 sleeved on the first output shaft 42. On one side of the first output shaft 42, a mid-power intermediate shaft 82 is provided. A first mid-power output intermediate gear 83 meshing with the first mid-power output drive gear 81 is sleeved on the mid-power intermediate shaft 82. The first mid-power output drive gear 81 drives the first mid-power output intermediate gear 83 to rotate, transmitting the power from the first output shaft 42 to the mid-power intermediate shaft 82. A second mid-power output intermediate gear 84 is sleeved on the mid-power intermediate shaft 82 on one side of the first mid-power output intermediate gear 83. The mid-power intermediate shaft 82 drives the second mid-power output intermediate gear 84 to rotate. On one side of the mid-power intermediate shaft 82, a first mid-power output shaft 85 is provided. A spline sleeve is provided between the first mid-power output shaft 85 and the rear power input shaft 71. A first mid-power output driven gear 86 meshing with the second mid-power output intermediate gear 84 is sleeved on the first mid-power output shaft 85. When the second mid-power output intermediate gear 84 rotates, it drives the first mid-power output driven gear 86 to rotate; On the middle power output shaft 85 on one side of the middle power output driven gear 86, there is a meshing seat 87. A meshing sleeve 88 is sleeved outside the meshing seat 87. The meshing seat 87 provides a meshing seat for the meshing sleeve 88 to realize the selection of power transmission. The meshing sleeve 88 is engaged with the middle power output driven gear 86 through sliding to realize the power transmission to the middle power output shaft 85. The middle power output shaft 85 drives the middle power output driving gear 89 to rotate, and at the same time transmits the power to the rear power input shaft 71 to drive the rear power output assembly 7 to operate. A middle power output driving gear 89 is sleeved on the middle power output shaft 85 on the side where the meshing sleeve 88 is away from the middle power output driven gear 86. When the meshing sleeve 88 is combined, the middle power output driving gear 89 drives the middle power output intermediate gear to rotate and transmits the power to the middle power output intermediate shaft 810. There is a middle power output intermediate shaft 810 on one side of the middle power output shaft 85. A middle power output intermediate gear 811 meshing with the middle power output driving gear 89 is sleeved on the middle power output intermediate shaft 810. The middle power output intermediate shaft 810 serves as an intermediate link for power transmission, connecting the middle power output driving gear 89 and the middle power output intermediate gear 811. The middle power output intermediate gear 811 transmits the power to the middle power output driven gear 813. There is a middle power output shaft 812 on the side of the middle power output intermediate shaft 810 away from the middle power output shaft 85. A middle power output driven gear 813 meshing with the middle power output intermediate gear 811 is sleeved on the middle power output shaft 812. The middle power output driven gear 813 meshes with the middle power output intermediate gear 811 to transmit the power from the middle power output intermediate shaft 810 to the middle power output shaft 812, and then to the equipment in the middle of the tractor.

[0028] The front drive axle assembly 9 includes a front drive active gear 91 disposed on the output shaft 57 of the transmission assembly. The front drive active gear 91 transmits power from the output shaft 57 of the transmission assembly to the front drive passive gear 93 and the front drive axle input shaft 92. A front drive axle input shaft 92 is disposed on one side of the output shaft 57 of the transmission assembly. The front drive axle input shaft 92 receives the power input from the front drive active gear 91 and transmits it to the front differential input shaft 96 through a universal joint 94. A front drive passive gear 93 meshing with the front drive active gear 91 is sleeved on the front drive axle input shaft 92. The front drive passive gear 93 meshes with the front drive active gear 91 to transmit power. A front differential 95 is disposed on one side of the front drive passive gear 93. The front differential 95 allows the left and right front wheels to rotate at different speeds to adapt to the speed difference during turning. A front differential input shaft 96 is disposed on one side of the front differential 95. The front differential input shaft 96 receives the power input from the front drive axle input shaft 92. A universal joint 94 is disposed between the front differential input shaft 96 and the front drive axle input shaft 92. The universal joint 94 allows a certain angular deviation between the front drive axle input shaft 92 and the front differential input shaft 96 and transmits power at the same time. A central drive active bevel gear II 97 is sleeved on the front differential input shaft 96. A front differential output shaft 98 is disposed in the middle of the front differential 95. A central drive passive bevel gear II 99 meshing with the central drive active bevel gear II 97 is sleeved on one side of the front differential output shaft 98. The front differential input shaft 96 drives the central drive active bevel gear II 97 to rotate. Through the cooperation of the central drive active bevel gear II 97 and the central drive passive bevel gear II 99, power is transmitted from the front differential input shaft 96 to the front differential output shaft 98. A pair of final drive active bevel gears II 910 are symmetrically sleeved on both sides of the front differential output shaft 98. When the front differential output shaft 98 rotates, it drives the final drive active bevel gears II 910 to rotate. A drive shaft I 911 is disposed on both sides of the front differential output shaft 98. A pair of final drive intermediate bevel gears 912 are symmetrically sleeved on each of the two drive shafts I 911. The right final drive intermediate bevel gear 912 meshes with the final drive active bevel gear II 910. The final drive active bevel gear II 910 drives the right final drive intermediate bevel gear 912 to rotate, and then drives the drive shaft I 911 and the left final drive intermediate bevel gear 912 to rotate. A front wheel drive shaft 913 is disposed on one side of each of the two drive shafts I 911. A final drive passive bevel gear II 914 is sleeved on each of the two front wheel drive shafts 913. The left final drive intermediate bevel gear 912 meshes with the final drive passive bevel gear II 914. When the left final drive intermediate bevel gear 912 rotates, it drives the final drive passive bevel gear II 914 to rotate, thereby transmitting power to the front wheel drive shaft 913. A tractor front wheel 915 is disposed at one end of each of the two front wheel drive shafts 913. The front wheel drive shaft 913 drives the tractor front wheel 915 to rotate, thereby realizing the four-wheel drive walking of the tractor.

[0029] During operation, after the engine 1 starts, it generates power which is first transmitted to the clutch 2. The clutch 2 controls the engagement and disengagement of the power according to the operating requirements. When power transmission is required, the clutch 2 engages and transmits the power to the first front speed increasing box 3. In the first front speed increasing box 3, the power enters through the front speed increasing box input shaft 31, driving the front input gear 32 to rotate. The front input gear 32 drives the front speed increasing box intermediate shaft 33 and the front intermediate gear 34 to rotate. The front intermediate gear 34 drives the front speed increasing box output shaft 35 and the front output gear 36 to rotate, realizing the output of the increased-speed power. The increased-speed power enters the first hydrostatic continuously variable transmission 4 and is received through the hydrostatic continuously variable transmission input shaft 41. The first hydrostatic continuously variable transmission 4 adjusts the internal swash plate angle according to the operating requirements to achieve continuously variable transmission, and outputs the variable-speed power through the first output shaft 42 and the second output shaft 43 respectively.

[0030] The power of the first output shaft 42 enters the mid-mounted power output assembly 8, driving the first mid-mounted power output driving gear 81 to rotate. The first mid-mounted power output driving gear 81 drives the mid-mounted power intermediate shaft 82, the first mid-mounted power output intermediate gear 83 and the second mid-mounted power output intermediate gear 84 to rotate. The second mid-mounted power output intermediate gear 84 drives the first mid-mounted power output driven gear 86 to rotate. If the third engagement sleeve 88 is not engaged with the first mid-mounted power output driven gear 86, the first mid-mounted power output shaft 85 remains stationary. If the third engagement sleeve 88 is engaged with the first mid-mounted power output driven gear 86, the power is transmitted to the first mid-mounted power output shaft 85 through the third engagement sleeve 88 and the third engagement tooth seat 87. The first mid-mounted power output shaft 85 drives the second mid-mounted power output driving gear 89 and the rear power input shaft 71 to rotate. The second mid-mounted power output driving gear 89 drives the mid-mounted power output intermediate shaft 810 and the mid-mounted power output intermediate gear to rotate. The mid-mounted power output intermediate gear drives the second mid-mounted power output shaft 812 and the second mid-mounted power output driven gear 813 to rotate, providing power for the equipment in the middle of the tractor. When the rear power input shaft 71 rotates, it drives the rear power output driving gear 72 to rotate. The rear power output driving gear 72 drives the rear power output shaft 73 and the rear power output driven gear 74 to rotate, thus transmitting the power to the equipment at the rear of the tractor.

[0031] The power of the output shaft II 43 enters the transmission assembly 5, driving the rotation of the input shaft 51 of the transmission assembly. In the neutral state, the input shaft 51 of the transmission assembly drives the high-speed driving gear 55 and the low-speed driving gear 56 to rotate, while the medium-speed driving gear 52 remains stationary. The high-speed driving gear 55 and the low-speed driving gear 56 respectively drive the high-speed driven gear 59 and the low-speed driven gear 510 to idle on the output shaft 57 of the transmission assembly, and the output shaft 57 of the transmission assembly remains stationary. If the low gear is engaged, the engaging sleeve II 512 engages with the low-speed driven gear 510, and the engaging sleeve I 54 is in the initial position. When the low-speed driven gear 510 rotates, it drives the output shaft 57 of the transmission assembly to rotate through the engaging sleeve II 512 and the engaging tooth seat II 511. If the medium gear is engaged, the engaging sleeve I 54 engages with the medium-speed driving gear 52, and the engaging sleeve II 512 is in the initial position. The input shaft 51 of the transmission assembly drives the medium-speed driving gear 52 to rotate through the engaging tooth seat I 53 and the engaging sleeve I 54. The medium-speed driving gear 52 drives the medium-speed driven gear 58 and the output shaft 57 of the transmission assembly to rotate. If the high gear is engaged, the engaging sleeve II 512 engages with the high-speed driven gear 59, and the engaging sleeve I 54 is in the initial position. When the high-speed driven gear 59 rotates, it drives the output shaft 57 of the transmission assembly to rotate through the engaging sleeve II 512 and the engaging tooth seat II 511. The power of the output shaft 57 of the transmission assembly is divided into two paths. One path is transmitted to the rear axle assembly 6. The output shaft 57 of the transmission assembly drives the input shaft 62 of the rear differential and the first central driving bevel gear 63 to rotate. The first central driving bevel gear 63 drives the output shaft 64 of the rear differential and the first central driven bevel gear 65 to rotate. When the output shaft 64 of the rear differential rotates, it drives the first final driving bevel gears 67 on both sides to rotate. The first final driving bevel gears 67 drive the rear wheel drive shafts 69 and the first final driven bevel gears 610 to rotate. The rear wheel drive shafts 69 on both sides drive the rear wheels 611 of the tractor to rotate, thus realizing the movement of the tractor. The other path is transmitted to the front drive axle assembly 9. The output shaft 57 of the transmission assembly drives the front driving gear 91 to rotate. The front driving gear 91 drives the input shaft 92 of the front drive axle and the front driven gear 93 to rotate. The input shaft 92 of the front drive axle transmits the power to the input shaft 96 of the front differential. The input shaft 96 of the front differential drives the second central driving bevel gear 97 to rotate. The second central driving bevel gear 97 drives the output shaft 98 of the front differential and the second central driven bevel gear 99 to rotate. The output shaft 98 of the front differential drives the second final driving bevel gears 910 on both sides to rotate. The second final driving bevel gears 910 drive the first drive shafts 911 and the intermediate final driving bevel gear 912 to rotate. The intermediate final driving bevel gear 912 drives the front wheel drive shafts 913 and the second final driven bevel gears 914 to rotate. The front wheel drive shafts 913 drive the front wheels 915 of the tractor to rotate, thus realizing the four-wheel drive of the tractor.

[0032] During driving, if the tractor gets stuck and needs to get out of trouble, the differential lock 66 can be operated to lock the left and right rear wheels, increasing the ability to get out of trouble. At the same time, the brake 68 is used to decelerate or stop the tractor to ensure driving safety.

[0033] It should be understood that the above specific embodiments of the present invention are only for illustrative explanation or interpretation of the principles of the present invention, and do not constitute a limitation to the present invention. Therefore, any modifications, equivalent replacements, improvements, etc. made without departing from the spirit and scope of the present invention shall be included within the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A continuously variable transmission system for a tractor, comprising: Engine (1), a clutch (2) is provided at the output end of the engine (1), and a first front speed increasing box (3) is provided at the output end of the clutch (2), characterized in that: a first hydrostatic continuously variable transmission (4) is provided at the output end of the first front speed increasing box (3), a transmission assembly (5), a mid-mounted power output assembly (8) and a rear-mounted power output assembly (7) are provided at the output end of the first hydrostatic continuously variable transmission (4), a rear axle assembly (6) and a front drive axle assembly (9) are provided at the output end of the transmission assembly (5); A hydrostatic continuously variable transmission input shaft (41) is provided inside the first hydrostatic continuously variable transmission (4), and an output shaft one (42) and an output shaft two (43) are provided on one side of the first hydrostatic continuously variable transmission (4) away from the hydrostatic continuously variable transmission input shaft (41); A front speed increasing box input shaft (31) is provided inside the first front speed increasing box (3), the front speed increasing box input shaft (31) is connected to the output end of the clutch (2), a front input gear (32) is sleeved on the front speed increasing box input shaft (31), a front speed increasing box intermediate shaft (33) is provided on one side of the front speed increasing box input shaft (31), and a front intermediate gear (34) meshing with the front input gear (32) is sleeved on the front speed increasing box intermediate shaft (33); The transmission assembly (5) includes a transmission assembly input shaft (51), a spline sleeve is provided between the transmission assembly input shaft (51) and the output shaft two (43), a mid-range driving gear (52) is sleeved on the transmission assembly input shaft (51), a first meshing tooth seat (53) is provided on the transmission assembly input shaft (51) on one side of the mid-range driving gear (52), and a first meshing sleeve (54) is sleeved outside the first meshing tooth seat (53).

2. The continuously variable transmission system of a tractor according to claim 1, wherein: A front speed increasing box output shaft (35) is provided on one side of the front speed increasing box intermediate shaft (33) away from the front speed increasing box input shaft (31), a spline sleeve is provided between the hydrostatic continuously variable transmission input shaft (41) and the front speed increasing box output shaft (35), and a front output gear (36) meshing with the front intermediate gear (34) is sleeved on the front speed increasing box output shaft (35).

3. A continuously variable transmission system for a tractor according to claim 1, characterized in that: A high-range driving gear (55) is sleeved on the transmission assembly input shaft (51) on one side of the mid-range driving gear (52) away from the first meshing sleeve (54), and a low-range driving gear (56) is sleeved on the transmission assembly input shaft (51) on one side of the high-range driving gear (55) away from the mid-range driving gear (52).

4. The continuously variable transmission system of a tractor according to claim 3, characterized in that: On one side of the input shaft (51) of the transmission assembly, there is an output shaft (57) of the transmission assembly. A second-speed driven gear (58) meshing with the second-speed driving gear (52) is sleeved on the output shaft (57) of the transmission assembly. A high-speed driven gear (59) meshing with the high-speed driving gear (55) is sleeved on the output shaft (57) of the transmission assembly. A low-speed driven gear (510) meshing with the low-speed driving gear (56) is sleeved on the output shaft (57) of the transmission assembly. On the output shaft (57) of the transmission assembly between the high-speed driven gear (59) and the low-speed driven gear (510), there is a second engaging tooth seat (511). An engaging sleeve two (512) is sleeved outside the second engaging tooth seat (511).

5. A continuously variable transmission system for a tractor according to claim 4, characterized in that: The rear axle assembly (6) includes a first rear differential (61). A rear differential input shaft (62) is arranged on the first rear differential (61). The rear differential input shaft (62) is connected to the output shaft (57) of the transmission assembly. A first central driving bevel gear (63) is sleeved on the rear differential input shaft (62). A rear differential output shaft (64) is arranged in the middle of the first rear differential (61). A first central driven bevel gear (65) meshing with the first central driving bevel gear (63) is sleeved on the rear differential output shaft (64). A differential lock (66) is arranged on one side of the rear differential output shaft (64) far from the first central driven bevel gear (65).

6. A continuously variable transmission system for a tractor according to claim 5, characterized in that: A pair of first final driving gears (67) are symmetrically sleeved on both sides of the rear differential output shaft (64). A brake (68) is arranged on one side of each of the two first final driving gears (67). A pair of rear wheel drive shafts (69) are arranged on one side of the first rear differential (61). A first final driven gear (610) meshing with the first final driving gear (67) is sleeved on each of the two rear wheel drive shafts (69). A tractor rear wheel (611) is arranged at one end of each of the two rear wheel drive shafts (69).

7. A continuously variable transmission system for a tractor according to claim 1, characterized in that: The rear power output assembly (7) includes a rear power input shaft (71). A rear power output driving gear (72) is sleeved on the rear power input shaft (71). A rear power output shaft (73) is arranged on one side of the rear power input shaft (71). A rear power output driven gear (74) meshing with the rear power output driving gear (72) is sleeved on the rear power output shaft (73).

8. A continuously variable transmission system for a tractor according to claim 7, characterized in that: The central power output component (8) includes a central power output driving gear one (81) sleeved on the first output shaft (42). On one side of the first output shaft (42), there is a central power intermediate shaft (82). A central power output intermediate gear one (83) meshing with the central power output driving gear one (81) is sleeved on the central power intermediate shaft (82). A central power output intermediate gear two (84) is sleeved on the central power intermediate shaft (82) on one side of the central power output intermediate gear one (83). On one side of the central power intermediate shaft (82), there is a first central power output shaft (85). A spline sleeve is arranged between the first central power output shaft (85) and the rear power input shaft (71). A central power output driven gear one (86) meshing with the central power output intermediate gear two (84) is sleeved on the first central power output shaft (85). On the first central power output shaft (85) on one side of the central power output driven gear one (86), there is a third meshing tooth seat (87). An outer meshing sleeve three (88) is sleeved on the third meshing tooth seat (87). A central power output driving gear two (89) is sleeved on the first central power output shaft (85) on the side of the meshing sleeve three (88) away from the central power output driven gear one (86). On one side of the first central power output shaft (85), there is a central power output intermediate shaft (810). A central power output intermediate gear three (811) meshing with the central power output driving gear two (89) is sleeved on the central power output intermediate shaft (810). On the side of the central power output intermediate shaft (810) away from the first central power output shaft (85), there is a second central power output shaft (812). A central power output driven gear two (813) meshing with the central power output intermediate gear three (811) is sleeved on the second central power output shaft (812).

9. A continuously variable transmission system for a tractor according to claim 4, characterized in that: The front drive axle component (9) includes a front drive driving gear (91) arranged on the output shaft of the transmission assembly (57). On one side of the output shaft of the transmission assembly (57), there is a front drive axle input shaft (92). A front drive driven gear (93) meshing with the front drive driving gear (91) is sleeved on the front drive axle input shaft (92). On one side of the front drive driven gear (93), there is a first front differential (95). On one side of the first front differential (95), there is a front differential input shaft (96). A universal joint (94) is arranged between the front differential input shaft (96) and the front drive axle input shaft (92). A second central drive pinion gear (97) is sleeved on the front differential input shaft (96). A front differential output shaft (98) is arranged in the middle of the first front differential (95). A second central drive driven pinion gear (99) meshing with the second central drive pinion gear (97) is sleeved on one side of the front differential output shaft (98). A pair of second final drive drive pinion gears (910) are symmetrically sleeved on both sides of the front differential output shaft (98). A first transmission shaft (911) is arranged on both sides of the front differential output shaft (98). A pair of second final drive intermediate pinion gears (912) are symmetrically sleeved on each of the two first transmission shafts (911). The second final drive intermediate pinion gear (912) on the right side meshes with the second final drive drive pinion gear (910). A front wheel transmission shaft (913) is arranged on one side of each of the two first transmission shafts (911). A second final drive driven pinion gear (914) is sleeved on each of the two front wheel transmission shafts (913). The second final drive intermediate pinion gear (912) on the left side meshes with the second final drive driven pinion gear (914). A tractor front wheel (915) is arranged at one end of each of the two front wheel transmission shafts (913).

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