Tractor stepless speed change transmission system

Abstract

The utility model 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 stepless transmission. The front speed increasing box I and the hydrostatic stepless speed changer I are arranged, the front speed increasing box I 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] This utility model relates to the field of agricultural machinery and equipment technology, and in particular to a continuously variable transmission system for tractors. Background Technology

[0002] The tractor transmission system is a mechanical assembly that connects the engine and the drive wheels, transmits and regulates the power generated by the engine as needed, and enables the tractor to move forward, backward, change speed, and perform differential steering.

[0003] However, the power transmission components of traditional tractor transmission systems are not compact enough, resulting in low transmission efficiency and difficulty in providing high-speed power input to optimize overall performance. Secondly, the speed change function of traditional tractor transmission systems is severely limited, with a large speed range and no continuously variable transmission, making it difficult to adapt to complex working conditions. At the same time, unstable speed changes can also affect driving comfort. In addition, when transmitting power to the middle and rear equipment, traditional tractor transmission systems cannot flexibly connect or disconnect power transmission according to the actual working conditions, which not only makes it difficult to meet diverse power needs but also easily leads to power waste. Utility Model Content

[0004] The purpose of this invention is to provide a continuously variable transmission system for tractors to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: it includes an engine, the output end of which is provided with a clutch, the output end of which is provided with a front speed-increasing gearbox, the output end of which is provided with a hydrostatic continuously variable transmission (CVT), the output end of which is provided with a gearbox assembly, a mid-mounted power output component and a rear-mounted power output component, and the output end of which is provided with a rear axle assembly and a front drive axle assembly;

[0006] The hydrostatic continuously variable transmission (CVT) is equipped with an input shaft, and an output shaft 1 and an output shaft 2 are located on the side of the CVT away from the input shaft.

[0007] In a preferred embodiment of this invention, a front speed-increasing gearbox is provided inside the front speed-increasing gearbox, the front speed-increasing gearbox input shaft is connected to the output end of the clutch, a front input gear is sleeved on the front speed-increasing gearbox input shaft, a front speed-increasing gearbox intermediate shaft is provided on one side of the front speed-increasing gearbox input shaft, a front intermediate gear meshing with the front input gear is sleeved on the front speed-increasing gearbox intermediate shaft, a front speed-increasing gearbox output shaft is provided on the side of the front speed-increasing gearbox intermediate shaft away from the front speed-increasing gearbox input shaft, a spline sleeve is provided between the input shaft of the hydrostatic continuously variable transmission and the output shaft of the front speed-increasing gearbox, and a front output gear meshing with the front intermediate gear is sleeved on the output shaft of the front speed-increasing gearbox.

[0008] In a preferred embodiment of this invention, the gearbox assembly includes a gearbox assembly input shaft, a spline sleeve is provided between the gearbox assembly input shaft and the output shaft, a mid-range drive gear is sleeved on the gearbox assembly input shaft, a meshing gear seat is provided on the gearbox assembly input shaft on one side of the mid-range drive gear, a meshing sleeve is sleeved on the outer side of the meshing gear seat, a high-range drive gear is sleeved on the gearbox assembly input shaft on the side of the mid-range drive gear away from the meshing sleeve, and a low-range drive gear is sleeved on the side of the high-range drive gear away from the mid-range drive gear.

[0009] As a preferred embodiment of this utility model, a transmission assembly output shaft is provided on one side of the input shaft of the transmission assembly. A medium-gear driven gear that meshes with the medium-gear drive gear is sleeved on the transmission assembly output shaft. A high-gear driven gear that meshes with the high-gear drive gear is sleeved on the transmission assembly output shaft. A low-gear driven gear that meshes with the low-gear drive gear is sleeved on the transmission assembly output shaft between the high-gear driven gear and the low-gear driven gear. A second meshing gear seat is provided on the outer side of the second meshing gear seat. A second meshing sleeve is sleeved on the outer side of the second meshing gear seat.

[0010] In a preferred embodiment of this invention, the rear axle assembly includes a rear differential, an input shaft for the rear differential, and an output shaft for the gearbox assembly. A central drive bevel gear is mounted on the input shaft. A rear differential output shaft is located in the middle of the rear differential, and a central drive driven bevel gear that meshes with the central drive bevel gear is mounted on the output shaft. A differential lock is located on the side of the rear differential output shaft away from the central drive driven bevel gear.

[0011] As a preferred embodiment of this utility model, a pair of final drive gears are symmetrically mounted on both sides of the output shaft of the rear differential. A brake is provided on one side of each of the two final drive gears. A pair of rear wheel drive shafts are provided on one side of the rear differential. A final drive driven gear that meshes with the final drive gear is mounted on each of the two rear wheel drive shafts. A tractor rear wheel is provided at one end of each of the two rear wheel drive shafts.

[0012] As a preferred embodiment of the present invention, the rear power output assembly includes a rear power input shaft, a rear power output drive gear is sleeved on the rear power input shaft, a rear power output shaft is provided on one side of the rear power input shaft, and a rear power output driven gear that meshes with the rear power output drive gear is sleeved on the rear power output shaft.

[0013] As a preferred embodiment of this utility model, the central power output assembly includes a central power output drive gear one sleeved on an output shaft one, a central power intermediate shaft provided on one side of the output shaft one, a central power output intermediate gear one sleeved on the central power intermediate shaft that meshes with the central power output drive gear one, a central power output intermediate gear two sleeved on the central power intermediate shaft on one side of the central power output intermediate gear one, a central power output shaft one provided on one side of the central power intermediate shaft, a spline sleeve provided between the central power output shaft one and the rear power input shaft, and a central power output driven gear one sleeved on the central power output shaft one that meshes with the central power output intermediate gear two;

[0014] A meshing gear seat three is provided on one side of the centrally located power output driven gear one. A meshing sleeve three is sleeved on the outer side of the meshing gear seat three. A centrally located power output driving gear two is sleeved on the side of the centrally located power output driven gear one away from the centrally located power output driven gear one. A centrally located power output intermediate shaft is provided on one side of the centrally located power output shaft one. A centrally located power output intermediate gear three that meshes with the centrally located power output driving gear two is sleeved on the centrally located power output intermediate shaft one away from the centrally located power output shaft one. A centrally located power output driven gear two that meshes with the centrally located power output intermediate gear three is sleeved on the centrally located power output driven shaft one.

[0015] As a preferred embodiment of the present invention, the front drive axle assembly includes a front drive drive gear disposed on the output shaft of the transmission assembly, a front drive axle input shaft disposed on one side of the output shaft of the transmission assembly, a front drive driven gear meshing with the front drive drive gear sleeved on the front drive axle input shaft, a front differential I disposed on one side of the front drive driven gear, a front differential input shaft disposed on one side of the front differential I, and a universal joint disposed between the front differential input shaft and the front drive axle input shaft;

[0016] A central drive bevel gear 2 is mounted on the input shaft of the front differential. A front differential output shaft is located in the middle of the front differential. A central drive driven bevel gear 2, which meshes with the central drive drive bevel gear 2, is mounted on one side of the front differential output shaft. A pair of final drive drive bevel gears 2 are symmetrically mounted on both sides of the front differential output shaft. A drive shaft 1 is located on both sides of the front differential output shaft. A pair of final drive intermediate bevel gears are symmetrically mounted on both drive shafts 1. The right-side final drive intermediate bevel gear meshes with the final drive drive bevel gear 2. A front wheel drive shaft is located on one side of each of the two drive shafts 1. A final drive driven bevel gear 2 is mounted on each of the two front wheel drive shafts. The left-side final drive intermediate bevel gear meshes with the final drive driven bevel gear 2. A tractor front wheel is located at one end of each of the two front wheel drive shafts.

[0017] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial technical effects:

[0018] 1. This utility model, by setting up a front speed increaser and a hydrostatic continuously variable transmission, firstly, the front speed increaser achieves power increase through gear meshing transmission, with a compact structure and high transmission efficiency, which can provide higher speed power input for subsequent transmission components, thus optimizing the power transmission performance of the entire transmission system. Secondly, the hydrostatic continuously variable transmission can flexibly adjust the internal swashplate angle according to operational needs to achieve stepless speed change, enabling the tractor to adapt to various complex working conditions, improving the tractor's adaptability and work efficiency in different operating scenarios. At the same time, its smooth speed change characteristics also help to improve driving comfort.

[0019] 2. This utility model, by setting up a transmission assembly, a rear axle assembly, and a front drive axle assembly, firstly, connects the output shaft two to the input shaft of the transmission assembly via a spline sleeve, introducing power from the output shaft two. Since the transmission assembly has multiple gears, it can engage with different gears through a meshing sleeve to achieve various speed and direction-changing functions, meeting the power requirements of the tractor under different operating speeds and load conditions, and enhancing the tractor's operational flexibility and power matching. Secondly, the rear axle assembly outputs the power transmitted from the transmission assembly's output shaft to the tractor's rear wheels, driving the rear wheels to rotate and enabling the tractor to move. Simultaneously, the rear axle assembly achieves differential rotation of the left and right rear wheels through a differential, adapting to speed differences when the tractor turns, ensuring driving stability. Furthermore, the differential lock can lock the left and right rear wheels when stuck, enhancing the ability to escape difficulties. The brakes ensure driving safety. In addition, the front drive axle assembly transmits the power transmitted from the transmission assembly's output shaft to the tractor's front wheels, achieving four-wheel drive for the tractor, improving the tractor's passability and traction in complex road conditions, and ensuring stable and efficient operation of the tractor in various working environments.

[0020] 3. This utility model, by setting up a rear-mounted power output component and a mid-mounted power output component, firstly, the mid-mounted power output component adopts a multi-stage gear transmission structure to introduce power from the output shaft one. At the same time, it uses a meshing sleeve to realize the connection and disconnection of the power transmission path. When the meshing sleeve three meshes with the mid-mounted power output passive gear one, it can connect the power transmission paths in the mid-mounted power output component and the rear-mounted power output component, transmitting power to the middle and rear equipment of the tractor. This not only ensures the accuracy of power supply to the middle and rear equipment, but also provides a flexible interface for power transmission. Secondly, the rear-mounted power output component directly transmits power from the mid-mounted power output shaft one to the rear equipment of the tractor, providing stable and efficient power support for the rear working device, significantly improving the efficiency and quality of rear operations. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0023] Figure 3 for Figure 1 Enlarged view of point B in the middle;

[0024] Figure 4 for Figure 1 Enlarged view of point C in the middle;

[0025] Figure 5 for Figure 1 Enlarged view of point D;

[0026] Figure 6 for Figure 1 Enlarged diagram of point E in the middle.

[0027] Reference numerals: Engine 1, Clutch 2, Front speed increaser 1 3, Front speed increaser input shaft 31, Front input gear 32, Front speed increaser intermediate shaft 33, Front intermediate gear 34, Front speed increaser output shaft 35, Front output gear 36, Hydrostatic continuously variable transmission 1 4, Hydrostatic continuously variable transmission input shaft 41, Output shaft 1 42, Output shaft 2 43, Gearbox assembly 5, Gearbox assembly input shaft 51, Intermediate drive gear 52, Engaging gear seat 1 53, Engaging sleeve 1 54, High-gear drive gear 55, Low-gear drive gear 56, Gearbox assembly output shaft 57, Intermediate driven gear; 58, High driven gear; 59, Low driven gear; 510, Meshing gear seat 2; 511, Meshing sleeve 2; 512, Rear axle assembly; 6, Rear differential 1; 61, Rear differential input shaft; 62, Central drive drive bevel gear 1; 63, Rear differential output shaft; 64, Central drive driven bevel gear 1; 65, Differential lock; 66, Final drive drive gear 1; 67, Brake; 68, Rear wheel drive shaft; 69, Final drive driven gear 1; 610, Tractor rear wheel; 611, Rear power take-off assembly; 7, Rear power input shaft; 71, Rear... Power output drive gear 72, rear power output shaft 73, rear power output driven gear 74, mid-mounted power output assembly 8, mid-mounted power output drive gear one 81, mid-mounted power intermediate shaft 82, mid-mounted power output intermediate gear one 83, mid-mounted power output intermediate gear two 84, mid-mounted power output shaft one 85, mid-mounted power output driven gear one 86, meshing gear seat three 87, meshing sleeve three 88, mid-mounted power output drive gear two 89, mid-mounted power output intermediate shaft 810, mid-mounted power output intermediate gear three 811, mid-mounted power output... Shaft 2 812, Central drive output passive gear 2 813, Front drive axle assembly 9, Front drive drive gear 91, Front drive axle input shaft 92, Front drive passive gear 93, Universal joint 94, Front differential 1 95, Front differential input shaft 96, Central drive drive bevel gear 2 97, Front differential output shaft 98, Central drive passive bevel gear 2 99, Final drive drive bevel gear 2 910, Drive shaft 1 911, Final drive intermediate bevel gear 912, Front wheel drive shaft 913, Final drive passive bevel gear 2 914, Tractor front wheel 915. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0029] like Figures 1-6As shown, the present invention proposes a continuously variable transmission system for a tractor, which includes an engine 1 that provides the power required for the operation of the tractor. The output end of the engine 1 is provided with a clutch 2, which controls the engagement and disengagement of power from the engine 1 to the subsequent transmission components. The output end of the clutch 2 is provided with a front speed increaser 3. The output end of the front speed increaser 3 is provided with a hydrostatic continuously variable transmission 4. The output end of the hydrostatic continuously variable transmission 4 is provided with a gearbox assembly 5, a mid-mounted power take-off component 8, and a rear-mounted power take-off component 7. The output end of the gearbox assembly 5 is provided with a rear axle assembly 6 and a front drive axle assembly 9.

[0030] The hydrostatic continuously variable transmission 4 is equipped with a hydrostatic continuously variable transmission input shaft 41. On the side of the hydrostatic continuously variable transmission 4 away from the input shaft 41, there are output shaft 42 and output shaft 43. Output shaft 42 outputs the power after the speed change, mainly supplying the mid-mounted power output component 8. Output shaft 43 outputs the power after the speed change, mainly supplying the gearbox assembly 5.

[0031] The front speed increaser 3 is equipped with a front speed increaser input shaft 31, which is connected to the output end of the clutch 2. The front speed increaser input shaft 31 receives power input from the clutch 2. A front input gear 32 is mounted on the front speed increaser input shaft 31, which transmits power from the front speed increaser input shaft 31 to the front speed increaser intermediate shaft 33. A front speed increaser intermediate shaft 33 is located on one side of the front speed increaser input shaft 31, and a front intermediate gear 34 that meshes with the front input gear 32 is mounted on the front speed increaser intermediate shaft 33. The front speed increaser intermediate shaft 33 and the front intermediate gear 34 serve as an intermediate ring for power transmission. The front input gear 32 and the front output gear 36 are connected. The front speed increaser intermediate shaft 33 is located on the side away from the front speed increaser input shaft 31, and the front speed increaser output shaft 35 is provided. A spline sleeve is provided between the hydrostatic continuously variable transmission input shaft 41 and the front speed increaser output shaft 35. The hydrostatic continuously variable transmission input shaft 41 receives power input from the front speed increaser output shaft 35. The front speed increaser output shaft 35 is fitted with the front output gear 36, which meshes with the front intermediate gear 34. The front output gear 36 transmits power from the front speed increaser intermediate shaft 33 to the front speed increaser output shaft 35, and the front speed increaser output shaft 35 outputs the accelerated power.

[0032] The gearbox assembly 5 includes a gearbox assembly input shaft 51. A spline sleeve is provided between the gearbox assembly input shaft 51 and the output shaft 43. The gearbox assembly input shaft 51 receives power input from the hydrostatic continuously variable transmission 4. A mid-range drive gear 52 is sleeved on the gearbox assembly input shaft 51. When the mid-range gear is engaged, the mid-range drive gear 52 transmits power to the mid-range driven gear 58. A meshing gear seat 53 is provided on the gearbox assembly input shaft 51 on one side of the mid-range drive gear 52. A meshing sleeve 54 is sleeved on the outside of the meshing gear seat 53. The meshing gear seat 53 is the meshing sleeve 54. 4. A gear seat is provided for gear selection. The meshing sleeve 54 engages with the intermediate gear drive gear 52 through sliding to achieve gear switching. A high gear drive gear 55 is sleeved on the gearbox assembly input shaft 51 on the side of the intermediate gear drive gear 52 away from the meshing sleeve 54. When a high gear is engaged, the high gear drive gear 55 transmits power to the high gear driven gear 59. A low gear drive gear 56 is sleeved on the gearbox assembly input shaft 51 on the side of the high gear drive gear 55 away from the intermediate gear drive gear 52. When a low gear is engaged, the low gear drive gear 56 transmits power to the low gear driven gear 510.

[0033] A transmission assembly output shaft 57 is located on one side of the input shaft 51. The transmission assembly output shaft 57 outputs the power after gear shifting, supplying the rear axle assembly 6 and the front drive axle assembly 9. An intermediate driven gear 58 is mounted on the transmission assembly output shaft 57, meshing with the intermediate drive gear 52. The intermediate driven gear 58 meshes with the intermediate drive gear 52 to transmit intermediate gear power. A high-gear driven gear 59 is mounted on the transmission assembly output shaft 57, meshing with the high-gear drive gear 55. The high-gear driven gear 59 meshes with the high-gear drive gear 55 to transmit high-gear power. The transmission assembly outputs... A low-gear driven gear 510 is sleeved on shaft 57, meshing with the low-gear drive gear 56. The low-gear driven gear 510 meshes with the low-gear drive gear 56 to transmit low-gear power. A meshing gear seat 2 511 is provided on the output shaft 57 of the gearbox assembly between the high-gear driven gear 59 and the low-gear driven gear 510. A meshing sleeve 2 512 is sleeved on the outside of the meshing gear seat 2 511. The meshing gear seat 2 511 provides a gear seat for meshing sleeve 2 512 to achieve gear selection. The meshing sleeve 2 512 engages with the high-gear driven gear 59 or the low-gear driven gear 510 by sliding to achieve gear switching.

[0034] The rear axle assembly 6 includes a rear differential 61, which allows the left and right rear wheels to rotate at different speeds to accommodate speed differences during cornering. A rear differential input shaft 62 is mounted on the rear differential 61, and is connected to the output shaft 57 of the transmission assembly. The rear differential input shaft 62 receives power input from the transmission assembly output shaft 57. A central drive bevel gear 63 is mounted on the rear differential input shaft 62. A rear differential output... The rear differential output shaft 64 is fitted with a central drive driven bevel gear 65 that meshes with the central drive driving bevel gear 63. The central drive driving bevel gear 63 and the central drive driven bevel gear 65 work together to transmit power from the rear differential input shaft 62 to the rear differential output shaft 64. A differential lock 66 is provided on the side of the rear differential output shaft 64 away from the central drive driven bevel gear 65. When the tractor is stuck, the differential lock 66 locks the left and right rear wheels to increase the ability to get out of trouble.

[0035] A pair of final drive gears 67 are symmetrically mounted on both sides of the rear differential output shaft 64. The rear differential output shaft 64 outputs power to the final drive gears 67. A brake 68 is provided on one side of each of the two final drive gears 67. The brake 68 enables the tractor to decelerate or stop. A pair of rear wheel drive shafts 69 are provided on one side of the rear differential 61. A final drive driven gear 610 that meshes with the final drive gear 67 is mounted on each of the two rear wheel drive shafts 69. The final drive gears 67 and 610 work together to transmit power from the rear differential output shaft 64 to the rear wheel drive shafts 69. A tractor rear wheel 611 is provided at one end of each of the two rear wheel drive shafts 69. The rear wheel drive shafts 69 output power to the tractor rear wheel 611, driving the tractor rear wheel 611 to rotate, thus enabling the tractor to move.

[0036] The rear power output assembly 7 includes a rear power input shaft 71, which receives power input from the central power output shaft 85. A rear power output drive gear 72 is mounted on the rear power input shaft 71. A rear power output shaft 73 is located on one side of the rear power input shaft 71. A rear power output driven gear 74, which meshes with the rear power output drive gear 72, is mounted 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 power from the rear power input shaft 71 to the rear power output shaft 73, thereby transmitting power to the equipment at the rear of the tractor.

[0037] The mid-drive power output assembly 8 includes a mid-drive power output gear 81 mounted on an output shaft 42. A mid-drive intermediate shaft 82 is located on one side of the output shaft 42. A mid-drive intermediate gear 83, meshing with the mid-drive power output gear 81, is mounted on the mid-drive intermediate shaft 82. The mid-drive power output gear 81 drives the mid-drive intermediate gear 83 to rotate, transmitting power from the output shaft 42 to the mid-drive intermediate shaft 82. The mid-drive intermediate shaft 82 is located on one side of the mid-drive intermediate gear 83. 2. A centrally located power output intermediate gear 2 84 is fitted on the upper part. The centrally located power intermediate shaft 82 drives the centrally located power output intermediate gear 2 84 to rotate. A centrally located power output shaft 1 85 is provided on one side of the centrally located power intermediate shaft 82. A spline sleeve is provided between the centrally located power output shaft 1 85 and the rear power input shaft 71. A centrally located power output driven gear 1 86 that meshes with the centrally located power output intermediate gear 2 84 is fitted on the centrally located power output shaft 1 85. When the centrally located power output intermediate gear 2 84 rotates, it drives the centrally located power output driven gear 1 86 to rotate.

[0038] A meshing gear seat 3 87 is provided on the central power output shaft 85 on one side of the central power output driven gear 86. A meshing sleeve 3 88 is sleeved on the outer side of the meshing gear seat 3 87. The meshing gear seat 3 87 provides a gear seat for the meshing sleeve 3 88 to engage, realizing the selection of power transmission. The meshing sleeve 3 88 engages with the central power output driven gear 86 through sliding, realizing the power transmission to the central power output shaft 85. The central power output shaft 85 drives the central power output driving gear 2 89 to rotate, and at the same time transmits power to the rear power input shaft 71, driving the rear power output assembly 7 to operate. A central power output driving gear 2 89 is sleeved on the central power output shaft 85 on the side of the meshing sleeve 3 88 away from the central power output driven gear 86. When the meshing sleeve 3 88 is engaged, the central power output driving gear 2 89 drives the central power output intermediate gear to rotate, transmitting power to the central power output intermediate shaft 810. A meshing gear seat 3 87 is provided on one side of the central power output shaft 85. A centrally located power output intermediate shaft 810 is provided, on which a centrally located power output intermediate gear 811 meshes with a centrally located power output drive gear 89. The centrally located power output intermediate shaft 810 serves as an intermediate link in power transmission, connecting the centrally located power output drive gear 89 and the centrally located power output intermediate gear 811. The centrally located power output intermediate gear 811 transmits power to the centrally located power output driven gear 813. A centrally located power output shaft 812 is provided on the side of the centrally located power output intermediate shaft 810 away from the centrally located power output shaft 85. A centrally located power output driven gear 813 meshes with the centrally located power output intermediate gear 811 on the centrally located power output shaft 812. The centrally located power output driven gear 813 meshes with the centrally located power output intermediate gear 811, transmitting power from the centrally located power output intermediate shaft 810 to the centrally located power output shaft 812, and then to the central equipment of the tractor.

[0039] The front drive axle assembly 9 includes a front drive drive gear 91 mounted on the transmission assembly output shaft 57. The front drive drive gear 91 transmits power from the transmission assembly output shaft 57 to the front drive driven gear 93 and the front drive axle input shaft 92. A front drive axle input shaft 92 is located on one side of the transmission assembly output shaft 57. The front drive axle input shaft 92 receives power input from the front drive drive gear 91 and transmits it to the front differential input shaft 96 via a universal joint 94. A front drive driven gear 93, meshing with the front drive drive gear 91, is mounted on the front drive axle input shaft 92. The front drive drive gear 91 meshes with the front drive drive gear 93 to transmit power. A front differential 95 is provided on one side of the front drive driven gear 93. The front differential 95 allows the left and right front wheels to rotate at different speeds to adapt to the speed difference when turning. A front differential input shaft 96 is provided on one side of the front differential 95. The front differential input shaft 96 receives power input from the front drive axle input shaft 92. A universal joint 94 is provided 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, while transmitting power.

[0040] A central drive bevel gear 97 is mounted on the front differential input shaft 96. A front differential output shaft 98 is located in the middle of the front differential 95. A central drive driven bevel gear 99, meshing with the central drive bevel gear 97, is mounted on one side of the front differential output shaft 98. The front differential input shaft 96 drives the central drive bevel gear 97 to rotate. Through the cooperation of the central drive bevel gear 97 and the central drive driven bevel gear 99, power is transmitted from the front differential input shaft 96 to the front differential output shaft 98. A pair of final drive drive bevel gears 910 are symmetrically mounted on both sides of the front differential output shaft 98. When the front differential output shaft 98 rotates, it drives the final drive drive bevel gears 910 to rotate. A drive shaft 911 is located on both sides of the front differential output shaft 98, and a pair of final drive intermediate bevel gears 912 are symmetrically mounted on each of the two drive shafts 911. The right final drive intermediate bevel gear 912 meshes with the final drive driving bevel gear 910. The final drive driving bevel gear 910 drives the right final drive intermediate bevel gear 912 to rotate, which in turn drives the drive shaft 911 and the left final drive intermediate bevel gear 912 to rotate. Each of the two drive shafts 911 has a front wheel drive shaft 913 on one side. Each of the two front wheel drive shafts 913 is fitted with a final drive driven bevel gear 914. The left final drive intermediate bevel gear 912 meshes with the final drive driven bevel gear 914. When the left final drive intermediate bevel gear 912 rotates, it drives the final drive driven bevel gear 914 to rotate, thereby transmitting power to the front wheel drive shaft 913. Each of the two front wheel drive shafts 913 has a tractor front wheel 915 at one end. The front wheel drive shaft 913 drives the tractor front wheel 915 to rotate, thereby realizing the four-wheel drive of the tractor.

[0041] In 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 power according to operational requirements. When power transmission is needed, the clutch 2 engages and transmits power to the front speed increaser 3. In the front speed increaser 3, the power enters through the input shaft 31, driving the front input gear 32 to rotate. The front input gear 32 drives the intermediate shaft 33 and the front intermediate gear 34 of the front speed increaser to rotate. The front intermediate gear 34 drives the output shaft 35 and the front output gear 36 of the front speed increaser to rotate, thereby achieving power acceleration and output. The accelerated power enters the hydrostatic continuously variable transmission 4 and is received through the input shaft 41. The hydrostatic continuously variable transmission 4 adjusts the internal swashplate angle according to operational requirements to achieve continuously variable transmission and outputs the accelerated power through the output shaft 42 and the output shaft 43 respectively.

[0042] The power from output shaft 42 enters the central power output assembly 8, driving the central power output drive gear 81 to rotate. The central power output drive gear 81 drives the central power intermediate shaft 82, the central power output intermediate gear 83, and the central power output intermediate gear 84 to rotate. The central power output intermediate gear 84 drives the central power output driven gear 86 to rotate. If the meshing sleeve 88 is not engaged with the central power output driven gear 86, the central power output shaft 85 remains stationary. If the meshing sleeve 88 engages with the central power output driven gear 86, the power is transmitted to the central power output shaft 85 through the meshing sleeve 88 and the meshing gear seat 87. 85. The centrally located power take-off shaft 85 drives the centrally located power take-off drive gear 89 and the rear power input shaft 71 to rotate. The centrally located power take-off drive gear 89 drives the centrally located power take-off intermediate shaft 810 and the centrally located power take-off intermediate gear to rotate. The centrally located power take-off intermediate gear drives the centrally located power take-off shaft 812 and the centrally located power take-off driven gear 813 to rotate, thus providing power to the equipment in the middle of the tractor. When the rear power input shaft 71 rotates, it drives the rear power take-off drive gear 72 to rotate. The rear power take-off drive gear 72 drives the rear power take-off shaft 73 and the rear power take-off driven gear 74 to rotate, thereby transmitting power to the equipment at the rear of the tractor.

[0043] The power from output shaft 2 43 enters the gearbox assembly 5, driving the input shaft 51 of the gearbox assembly to rotate. In neutral, the input shaft 51 of the gearbox assembly drives the high-gear drive gear 55 and the low-gear drive gear 56 to rotate, while the intermediate-gear drive gear 52 remains stationary. The high-gear drive gear 55 and the low-gear drive gear 56 respectively drive the high-gear driven gear 59 and the low-gear driven gear 510 to rotate freely on the output shaft 57 of the gearbox assembly, while the output shaft 57 of the gearbox assembly remains stationary. If a low gear is engaged, engagement sleeve 2 512 engages with the low-gear driven gear 510, and engagement sleeve 1 54 is in the initial position. When the low-gear driven gear 510 rotates, it drives the output shaft of the gearbox assembly through engagement sleeve 2 512 and engagement gear seat 2 511. When shaft 57 rotates, if intermediate gear is engaged, engagement sleeve 1 54 engages with intermediate gear drive gear 52, and engagement sleeve 2 512 is in its initial position. The input shaft 51 of the gearbox assembly drives the intermediate gear drive gear 52 to rotate via engagement gear seat 1 53 and engagement sleeve 1 54. The intermediate gear drive gear 52 drives the intermediate gear driven gear 58 and the output shaft 57 of the gearbox assembly to rotate. If high gear is engaged, engagement sleeve 2 512 engages with high gear driven gear 59, and engagement sleeve 1 54 is in its initial position. When high gear driven gear 59 rotates, it drives the output shaft 57 of the gearbox assembly to rotate via engagement sleeve 2 512 and engagement gear seat 2 511. The power of the output shaft 57 of the gearbox assembly is divided into two paths, one of which is transmitted to the rear axle assembly 6. 57 drives the rear differential input shaft 62 and the central drive drive bevel gear 63 to rotate. The central drive drive bevel gear 63 drives the rear differential output shaft 64 and the central drive driven bevel gear 65 to rotate. When the rear differential output shaft 64 rotates, it drives the final drive drive gears 67 on both sides to rotate. The final drive drive gears 67 drive the rear wheel drive shaft 69 and the final drive driven gear 610 to rotate. The rear wheel drive shafts 69 on both sides drive the tractor's rear wheels 611 to rotate, thus enabling the tractor to move. Another path transmits to the front drive axle assembly 9. The gearbox assembly output shaft 57 drives the front drive drive gear 91 to rotate. The front drive drive gear 91 drives the front drive axle input shaft 92 and the front drive driven gear 910 to rotate. 3. When the front drive axle input shaft 92 rotates, it transmits power to the front differential input shaft 96. The front differential input shaft 96 drives the central drive active bevel gear 97 to rotate. The central drive active bevel gear 97 drives the front differential output shaft 98 and the central drive passive bevel gear 99 to rotate. The front differential output shaft 98 drives the two final drive active bevel gears 910 on both sides to rotate. The final drive active bevel gears 910 drive the drive shaft 911 and the final drive intermediate bevel gear 912 to rotate. The final drive intermediate bevel gear 912 drives the front wheel drive shaft 913 and the final drive passive bevel gear 914 to rotate. The front wheel drive shaft 913 drives the tractor front wheel 915 to rotate, thus realizing four-wheel drive of the tractor.

[0044] If the tractor gets stuck during operation 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 slow down or stop the tractor to ensure driving safety.

[0045] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims 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 (CVT) system for a tractor, comprising: An engine (1), wherein a clutch (2) is provided at the output end of the engine (1), and a front speed-increasing gearbox (3) is provided at the output end of the clutch (2), characterized in that: a hydrostatic continuously variable transmission (4) is provided at the output end of the front speed-increasing gearbox (3), and a gearbox assembly (5), a mid-mounted power output component (8) and a rear-mounted power output component (7) are provided at the output end of the gearbox assembly (5), and a rear axle assembly (6) and a front drive axle assembly (9); The hydrostatic continuously variable transmission (CVT) 1 (4) is provided with a hydrostatic continuously variable transmission input shaft (41), and an output shaft 1 (42) and an output shaft 2 (43) are provided on the side of the hydrostatic continuously variable transmission 1 (4) away from the hydrostatic continuously variable transmission input shaft (41).

2. The continuously variable transmission system for a tractor according to claim 1, characterized in that: The front speed increaser 1 (3) is provided with a front speed increaser input shaft (31), which is connected to the output end of the clutch (2). A front input gear (32) is sleeved on the front speed increaser input shaft (31). A front speed increaser intermediate shaft (33) is provided on one side of the front speed increaser input shaft (31). A front intermediate gear (34) that meshes with the front input gear (32) is sleeved on the front speed increaser intermediate shaft (33). A front speed increaser output shaft (35) is provided on the side of the front speed increaser intermediate shaft (33) away from the front speed increaser input shaft (31). A spline sleeve is provided between the hydrostatic continuously variable transmission input shaft (41) and the front speed increaser output shaft (35). A front output gear (36) that meshes with the front intermediate gear (34) is sleeved on the front speed increaser output shaft (35).

3. The continuously variable transmission system for a tractor according to claim 1, characterized in that: The gearbox assembly (5) includes a gearbox assembly input shaft (51), a spline sleeve is provided between the gearbox assembly input shaft (51) and the output shaft (43), a mid-range drive gear (52) is sleeved on the gearbox assembly input shaft (51), a meshing gear seat (53) is provided on the gearbox assembly input shaft (51) on one side of the mid-range drive gear (52), a meshing sleeve (54) is sleeved on the outside of the meshing gear seat (53), a high-range drive gear (55) is sleeved on the gearbox assembly input shaft (51) on the side of the mid-range drive gear (52) away from the meshing sleeve (54), and a low-range drive gear (56) is sleeved on the side of the high-range drive gear (55) away from the mid-range drive gear (52).

4. A continuously variable transmission system for a tractor according to claim 3, characterized in that: A gearbox assembly output shaft (57) is provided on one side of the gearbox assembly input shaft (51). A medium-gear driven gear (58) meshing with a medium-gear drive gear (52) is sleeved on the gearbox assembly output shaft (57). A high-gear driven gear (59) meshing with a high-gear drive gear (55) is sleeved on the gearbox assembly output shaft (57). A low-gear driven gear (510) meshing with a low-gear drive gear (56) is sleeved on the gearbox assembly output shaft (57) between the high-gear driven gear (59) and the low-gear driven gear (510). A meshing gear seat two (511) is provided on the gearbox assembly output shaft (57) between the high-gear driven gear (59) and the low-gear driven gear (510). A meshing sleeve two (512) is sleeved on the outside of the meshing gear seat two (511).

5. A continuously variable transmission system for a tractor according to claim 4, characterized in that: The rear axle assembly (6) includes a rear differential (61), on which a rear differential input shaft (62) is provided. The rear differential input shaft (62) is connected to the output shaft (57) of the gearbox assembly. A central drive active bevel gear (63) is sleeved on the rear differential input shaft (62). A rear differential output shaft (64) is provided in the middle of the rear differential (61). A central drive passive bevel gear (65) that meshes with the central drive active bevel gear (63) is sleeved on the rear differential output shaft (64). A differential lock (66) is provided on the side of the rear differential output shaft (64) away from the central drive passive bevel gear (65).

6. A continuously variable transmission system for a tractor according to claim 5, characterized in that: A pair of final drive gears (67) are symmetrically mounted on both sides of the output shaft (64) of the rear differential. A brake (68) is provided on one side of each of the two final drive gears (67). A pair of rear wheel drive shafts (69) are provided on one side of the rear differential (61). A final drive driven gear (610) that meshes with the final drive gears (67) is mounted on each of the two rear wheel drive shafts (69). A tractor rear wheel (611) is provided 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 drive gear (72) is sleeved on the rear power input shaft (71), a rear power output shaft (73) is provided on one side of the rear power input shaft (71), and a rear power output driven gear (74) that meshes with the rear power output drive 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 mid-mounted power output assembly (8) includes a mid-mounted power output drive gear (81) sleeved on an output shaft (42), a mid-mounted power intermediate shaft (82) is provided on one side of the output shaft (42), a mid-mounted power output intermediate gear (83) meshing with the mid-mounted power output drive gear (81) is sleeved on the mid-mounted power intermediate shaft (82) on one side of the mid-mounted power output intermediate gear (83), a mid-mounted power output intermediate gear (84) is sleeved on the mid-mounted power intermediate shaft (82) on one side of the mid-mounted power output intermediate shaft (82), a mid-mounted power output shaft (85) is provided on one side of the mid-mounted power intermediate shaft (85), a spline sleeve is provided between the mid-mounted power output shaft (85) and the rear power input shaft (71), and a mid-mounted power output driven gear (86) meshing with the mid-mounted power output intermediate gear (84) is sleeved on the mid-mounted power output shaft (85). A meshing gear seat three (87) is provided on the central power output shaft one (85) on one side of the central power output passive gear one (86). A meshing sleeve three (88) is sleeved on the outside of the meshing gear seat three (87). A central power output active gear two (89) is sleeved on the central power output shaft one (85) on the side of the meshing sleeve three (88) away from the central power output passive gear one (86). A central power output intermediate shaft (810) is provided on one side of the central power output shaft one (85). The intermediate shaft (810) is fitted with a central power output intermediate gear three (811) that meshes with the central power output driving gear two (89). The central power output intermediate shaft (810) is provided with a central power output shaft two (812) on the side away from the central power output shaft one (85). The central power output shaft two (813) is fitted with a central power output passive gear two (813) that meshes with the central power output intermediate gear three (811).

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

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