Power transmission system and tractor

Abstract

The utility model relates to a power transmission system and a tractor, the power transmission system comprises a power input assembly, a speed change mechanism, a first small cone gear shaft, a second small cone gear shaft and a small cone connecting shaft, the power input assembly is connected with the input end of the speed change mechanism; the input end of the small cone connecting shaft and the input end of the first small cone gear shaft are connected with the output end of the speed change mechanism, and the output end of the first small cone gear shaft is used for being connected with a rear wheel. The output end of the small cone connecting shaft is connected with the input end of a second small cone gear shaft through a universal joint transmission shaft; and the universal joint transmission shaft is telescopic. The transmission mechanism is compact in structure, the shuttle type gear shifting driving gear shaft and the connecting shaft are sleeved on the power output front section shaft, the main speed change input shaft is sleeved on the PTO transmission shaft, the occupied space of the transmission mechanism is reduced, and the transmission mechanism has the advantages of high transmission efficiency, convenience in gear shifting, multiple gears and reasonable speed distribution, and can meet different requirements of various machines on the speed of the whole machine; and the axial distance is short.

Description

Technical Field

[0001] This utility model relates to the field of tractor technology, specifically to a power transmission system and a tractor. Background Technology

[0002] Hilly and mountainous areas have uneven terrain with significant undulations. Most planting areas have steep slopes and are not concentrated in contiguous plots, resulting in generally small planting areas. Therefore, there are currently few agricultural machines suitable for use in hilly and mountainous regions, and the main reliance is on manual and animal power, which is labor-intensive and generally results in low production efficiency.

[0003] As an important agricultural implement, tractors typically need to turn at the edge of the field when carrying rear-mounted agricultural tools, resulting in a large turning radius and low work efficiency. Furthermore, existing tractors for hilly and mountainous terrain suffer from limitations such as few gears, a narrow speed range, and a large axial distance in the transmission structure, making them ill-suited to the speed and turning radius requirements of hilly and mountainous terrain, as well as orchards and greenhouse operations.

[0004] Currently, hilly and mountain tractors suffer from problems such as few gears in the transmission system, small speed range, large turning radius, poor overall passability, and insufficient smoothness. These issues make it difficult for them to adapt to the complex working conditions in hilly and mountainous areas, affecting the overall driving and operational needs of the machines and thus hindering the development of agricultural mechanization in hilly and mountainous areas. Utility Model Content

[0005] This utility model provides a power transmission system and a tractor, aiming to solve the problems in the prior art.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0007] A power transmission system includes a power input component, a transmission mechanism, a first small bevel gear shaft, a second small bevel gear shaft, and a small bevel connecting shaft. The power input component is connected to the input end of the transmission mechanism and is used to connect to an engine and transmit the engine's power to the transmission mechanism.

[0008] The input end of the small conical connecting shaft and the input end of the first small conical gear shaft are respectively connected to the output end of the transmission mechanism. The output end of the first small conical gear shaft is used to connect to the rear wheel. The output end of the small conical connecting shaft is connected to the input end of the second small conical gear shaft through a universal joint drive shaft. The output end of the second small conical gear shaft is used to connect to the front wheel. The universal joint drive shaft is telescopic.

[0009] The beneficial effects of this utility model are as follows: During use, the engine's power is transmitted to the transmission mechanism by the power input component. On the one hand, the transmission mechanism transmits part of the power to the rear wheel via the first small bevel gear shaft; on the other hand, the transmission mechanism transmits another part of the power to the front wheel via the small bevel connecting shaft, the universal joint drive shaft and the second small bevel gear shaft, thereby realizing four-wheel drive.

[0010] This utility model has a compact structure. The shuttle-type shift drive gear shaft and connecting shaft are sleeved on the front section shaft of the power output, and the main speed input shaft is sleeved on the PTO transmission shaft, which reduces the space occupied by the transmission mechanism. It has the advantages of high transmission efficiency, convenient shifting, and reasonable speed distribution. It can meet the different speed requirements of various machines, and the axial distance is short.

[0011] Based on the above technical solution, the present invention can be further improved as follows.

[0012] Furthermore, the transmission mechanism includes a main transmission and an auxiliary transmission. The auxiliary transmission is fixedly installed on one side of the main transmission and is connected to the main transmission in a transmission manner. The power input assembly is connected to the main transmission. The input end of the small bevel connecting shaft and the input end of the first small bevel gear shaft are respectively connected to the auxiliary transmission.

[0013] The advantages of adopting the above-mentioned further scheme are that the structure is simple and the design is reasonable. After the power is transmitted to the main gearbox, the speed is changed through the cooperation of the internal structure of the main gearbox and the auxiliary gearbox, and then the power is output. The whole machine has multiple gears and reasonable speed distribution, which can meet the different speed requirements of various machines.

[0014] Furthermore, the power input assembly includes a hollow torsion intermediate drive shaft and a main transmission input shaft, respectively, with the main transmission input shaft passing through the main transmission; the output end of the torsion intermediate drive shaft is fixedly connected to the input end of the main transmission input shaft.

[0015] The advantages of adopting the above-mentioned further scheme are that the structure is simple and the design is reasonable. The power of the engine is transmitted to the main gearbox and the auxiliary gearbox through the torsion waist intermediate transmission shaft and the main transmission input shaft, so as to realize the power transmission.

[0016] At the same time, this twisting structure improves the machine's adaptability to hilly and mountainous areas, allowing the tires to better grip the ground and thus better utilize the machine's traction performance.

[0017] Furthermore, it also includes a shuttle shift mechanism and a shuttle shift drive gear shaft, wherein the output end of the shuttle shift drive gear shaft is fixedly connected to the input end of the shuttle shift mechanism, and the output end of the shuttle shift mechanism is fixedly connected to the input end of the twisting intermediate transmission shaft.

[0018] The advantages of adopting the above-mentioned further solution are that the structure is simple and the design is reasonable. The engine power is transmitted to the shuttle shift mechanism via the shuttle shift drive gear shaft, and then the shuttle shift mechanism changes the direction of power transmission to meet the power transmission requirements.

[0019] Furthermore, it also includes a PTO drive shaft, a PTO wet clutch, and a PTO input gear shaft. The PTO drive shaft passes through the power input assembly and the transmission mechanism, and is connected to the input end of the PTO input gear shaft through the PTO wet clutch. The output end of the PTO input gear shaft is used to connect agricultural implements.

[0020] The beneficial effect of adopting the above-mentioned further solution is that during use, part of the engine's power is transmitted to the PTO wet clutch and PTO input gear shaft via the PTO drive shaft, and then to the agricultural implement via the PTO input gear shaft, so as to provide power to the agricultural implement and facilitate operation.

[0021] Furthermore, it also includes a power output front shaft, the output end of which is fixedly connected to the input end of the PTO drive shaft, and its input end is used to connect to the engine.

[0022] The advantages of adopting the above-mentioned further solution are that the structure is simple and the design is reasonable. Part of the engine's power is transmitted to the PTO drive shaft through the power output front section shaft, which facilitates power transmission.

[0023] Furthermore, the two ends of the universal joint drive shaft are respectively connected to the output end of the small bevel connecting shaft and the input end of the second small bevel gear shaft via universal joints.

[0024] The advantages of adopting the above-mentioned further solution are that the structure is simple and the design is reasonable. The design of the universal joint drive shaft is relatively reasonable. It can swing left and right in hilly areas. The hilly areas have large undulations. The tires always keep in contact with the ground. It has good ground adaptability and ensures the product's traction requirements. In addition, it ensures that the front and rear wheels rotate at the same speed and there is no abnormal tire wear.

[0025] Furthermore, it also includes a second differential and a gearbox housing, the second differential being mounted on the gearbox housing and connected to the output end of the second small bevel gear shaft.

[0026] The advantages of adopting the above-mentioned further solution are that the structure is simple and the design is reasonable. The second differential can ensure that the wheel speeds of the two front wheels are different, making the vehicle more stable during cornering. In addition, the gearbox housing can be used as a support to facilitate the assembly of various components.

[0027] Furthermore, it also includes a first differential and a rear axle housing, the first differential being mounted on the rear axle housing and connected to the output end of the first small bevel gear shaft.

[0028] The advantages of adopting the above-mentioned further solution are that the structure is simple and the design is reasonable. The first differential can ensure that the wheel speeds of the two rear wheels are different, making the vehicle more stable during cornering. In addition, the rear axle housing can be used as a support to facilitate the assembly of various components.

[0029] This utility model also relates to a tractor, including the power transmission system described above.

[0030] The beneficial effect of adopting the above-mentioned further solution is that the present invention provides a tractor with a compact structure. The shuttle shift drive gear shaft and connecting shaft are sleeved on the power output front shaft, and the main transmission input shaft is sleeved on the PTO transmission shaft, which reduces the space occupied by the transmission mechanism. It has the advantages of high transmission efficiency, convenient shifting, multiple gears, and reasonable speed distribution, which can meet the different requirements of various implements for the overall speed, and the axial distance is short. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0032] Figure 2 This is a simplified diagram of the power transmission of this utility model;

[0033] Figure 3 This is a schematic diagram of the universal joint drive shaft in this utility model.

[0034] The attached diagram lists the components represented by each number as follows:

[0035] 1. Power Output Front Shaft; 2. PTO Drive Shaft; 3. PTO Wet Clutch; 4. PTO Input Gear Shaft; 5. Shuttle Shift Drive Gear Shaft; 6. Main Transmission Input Shaft; 7. Torque Intermediate Drive Shaft; 8. Small Bevel Connecting Shaft; 9. First Small Bevel Gear Shaft; 10. First Differential; 11. Universal Joint Drive Shaft; 12. Second Small Bevel Gear Shaft; 13. Second Differential; 14. Main Transmission; 15. Auxiliary Transmission; 16. Transmission Housing; 17. Rear Axle Housing; 18. Shuttle Shift Mechanism. Detailed Implementation

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0037] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] Example 1

[0041] like Figures 1 to 3 As shown, this embodiment provides a power transmission system, including a power input component, a transmission mechanism, a first small bevel gear shaft 9, a second small bevel gear shaft 12, and a small bevel connecting shaft 8. The power input component is connected to the input end of the transmission mechanism and is used to connect to the engine and transmit the engine's power to the transmission mechanism.

[0042] The input end of the small conical connecting shaft 8 and the input end of the first small conical gear shaft 9 are respectively connected to the output end of the transmission mechanism. The output end of the first small conical gear shaft 9 is used to connect to the rear wheel. The output end of the small conical connecting shaft 8 is connected to the input end of the second small conical gear shaft 12 through the universal joint drive shaft 11. The output end of the second small conical gear shaft 12 is used to connect to the front wheel. The universal joint drive shaft 11 is telescopic.

[0043] During use, the engine's power is transmitted to the transmission mechanism via the power input component. On one hand, the transmission mechanism transmits part of the power to the rear wheels via the first small bevel gear shaft 9; on the other hand, the transmission mechanism transmits another part of the power to the front wheels via the small bevel connecting shaft 8, the universal joint drive shaft 11, and the second small bevel gear shaft 12, thereby achieving four-wheel drive.

[0044] This embodiment has a compact structure. The shuttle shift drive gear shaft and connecting shaft are sleeved on the power output front shaft, and the main transmission input shaft is sleeved on the PTO transmission shaft, which reduces the space occupied by the transmission mechanism. It has the advantages of high transmission efficiency, convenient shifting, and reasonable speed distribution. It can meet the different speed requirements of various tools for the whole machine, and the axial distance is short.

[0045] Example 2

[0046] Based on Embodiment 1, in this embodiment, the transmission mechanism includes a main transmission 14 and a secondary transmission 15. The secondary transmission 15 is fixedly installed on one side of the main transmission 14 and is connected to the main transmission 14 in a transmission manner. The power input component is connected to the main transmission 14. The input end of the small conical connecting shaft 8 and the input end of the first small conical gear shaft 9 are respectively connected to the secondary transmission 15.

[0047] The scheme has a simple structure and reasonable design. After the power is transmitted to the main gearbox 14, the gear changes are achieved through the cooperation of the internal structure of the main gearbox 14 and the auxiliary gearbox 15, and then the power is output. The whole machine has multiple gears and reasonable speed distribution, which can meet the different speed requirements of various machines.

[0048] It should be noted that the main transmission 14 and the auxiliary transmission 15 mentioned above use existing technologies, and their specific structures and principles will not be described in detail here.

[0049] Example 3

[0050] Based on Embodiment 2, in this embodiment, the power input component includes a hollow torsion intermediate drive shaft 7 and a main transmission input shaft 6, respectively, with the main transmission input shaft 6 passing through the main transmission 14; the output end of the torsion intermediate drive shaft 7 is fixedly connected to the input end of the main transmission input shaft 6.

[0051] The scheme has a simple structure and reasonable design. The engine's power is transmitted to the main gearbox and the auxiliary gearbox via the torsion waist intermediate transmission shaft 7 and the main gearbox input shaft 6, thus realizing the power transmission.

[0052] At the same time, this twisting structure improves the machine's adaptability to hilly and mountainous areas, allowing the tires to better grip the ground and thus better utilize the machine's traction performance.

[0053] Example 4

[0054] Based on Embodiment 3, this embodiment also includes a shuttle shift mechanism 18 and a shuttle shift drive gear shaft 5. The output end of the shuttle shift drive gear shaft 5 is fixedly connected to the input end of the shuttle shift mechanism 18, and the output end of the shuttle shift mechanism 18 is fixedly connected to the input end of the twisting intermediate transmission shaft 7.

[0055] The scheme has a simple structure and reasonable design. The engine's power is transmitted to the shuttle shift mechanism 18 via the shuttle shift drive gear shaft 5, and then the shuttle shift mechanism 18 changes the direction of power transmission to meet the power transmission requirements.

[0056] Based on the above scheme, the input end of the shuttle shift drive gear shaft 5 is connected to the engine power output shaft via a clutch, and the output end of the shuttle shift drive gear shaft 5 is connected to the connecting shaft via a synchronizer to adjust the rotation direction of the connecting shaft; the connecting shaft is connected to the input end of the torsion waist intermediate transmission shaft 7 via a spline, and the output end of the torsion waist intermediate transmission shaft 7 is connected to one end of the main transmission input shaft 6, and the main transmission input shaft 6 is fitted with a main transmission gear sleeve and a secondary transmission gear sleeve.

[0057] It should be noted that the shuttle shifting mechanism 18 mentioned above uses existing technology, and its specific structure and principle will not be described in detail here.

[0058] Example 5

[0059] Based on the above embodiments, this embodiment also includes a PTO drive shaft 2, a PTO wet clutch 3, and a PTO input gear shaft 4. The PTO drive shaft 2 passes through the power input assembly and the transmission mechanism, and is connected to the input end of the PTO input gear shaft 4 through the PTO wet clutch 3. The output end of the PTO input gear shaft 4 is used to connect agricultural implements.

[0060] During use, part of the engine's power is transmitted to the PTO wet clutch 3 and the PTO input gear shaft 4 via the PTO drive shaft 2, and then to the agricultural implements via the PTO input gear shaft 4, so as to provide power to the agricultural implements and facilitate operation.

[0061] Preferably, in this embodiment, the PTO wet clutch 3 is provided with a first gear, which meshes with a second gear, and the second gear meshes with a third gear. The third gear is used to connect to a gear pump, and the rotation of the PTO drive shaft 2 provides power to the gear pump and provides a pressure oil source for the whole machine and tools.

[0062] Example 6

[0063] Based on Embodiment 5, this embodiment also includes a power output front shaft 1, the output end of which is fixedly connected to the input end of the PTO drive shaft 2, and its input end is used to connect to the engine.

[0064] The scheme has a simple structure and reasonable design. Part of the engine's power is transmitted to the PTO drive shaft 2 via the power output front shaft 1, which facilitates power transmission.

[0065] Based on the above scheme, the input end of the power output front shaft 1 is used to connect with the engine flywheel, the output end of the power output front shaft 1 is connected to the input end of the PTO drive shaft 2, the output end of the PTO drive shaft 2 is connected to one end of the PTO wet clutch 3, the other end of the PTO wet clutch 3 is connected to the input end of the PTO input gear shaft 4, and the output end of the PTO input gear shaft 4 is used to connect to agricultural implements so as to realize the operation of agricultural implements.

[0066] In addition, the engine flywheel is connected to the power output front shaft via a shock absorber. This design connects the engine flywheel and the power output front shaft 1 via a shock absorber, reducing vibration during power transmission.

[0067] It should be noted that the PTO wet clutch 3 mentioned above uses existing technology, and its specific structure and principle will not be described in detail here.

[0068] Example 7

[0069] Based on the above embodiments, in this embodiment, the two ends of the universal joint drive shaft 11 are respectively connected to the output end of the small bevel connecting shaft 8 and the input end of the second small bevel gear shaft 12 through universal joints.

[0070] The solution has a simple structure and reasonable design. The design of the universal joint drive shaft 11 is quite reasonable. It can swing left and right in hilly areas. The hilly areas have large undulations, and the tires always keep in contact with the ground. It has good ground adaptability and ensures the product's traction requirements. In addition, it ensures that the front and rear wheels rotate at the same speed, and there is no abnormal tire wear.

[0071] Example 8

[0072] Based on the above embodiments, this embodiment also includes a second differential 13 and a front wheel mounting bracket 16. The second differential 13 is mounted on the gearbox housing 16 and connected to the output end of the second small bevel gear shaft 12.

[0073] The design is simple and reasonable. The second differential 13 can ensure that the wheel speeds of the two front wheels are different, making the vehicle more stable during cornering. In addition, the gearbox housing 16 can be used as a support to facilitate the assembly of various components.

[0074] It should be noted that the second differential 13 mentioned above uses existing technology, and its specific structure and principle will not be described in detail here.

[0075] Example 9

[0076] Based on the above embodiments, this embodiment also includes a first differential 10 and a rear wheel mounting bracket 17. The first differential 10 is mounted on the rear axle housing 17 and connected to the output end of the first small bevel gear shaft 9.

[0077] The scheme has a simple structure and reasonable design. The first differential 10 can ensure that the wheel speeds of the two rear wheels are different, making the vehicle more stable during cornering. In addition, the rear axle housing 17 can be used as a support to facilitate the assembly of various components.

[0078] Based on the above scheme, a main transmission driven gear sleeve and a secondary transmission driven gear sleeve are sleeved on the small conical connecting shaft 8. The main transmission driven gear sleeve meshes with the main transmission gear sleeve through gears, and the secondary transmission driven gear sleeve meshes with the secondary transmission gear sleeve through gears. The output end of the small conical connecting shaft 8 is connected to the first small conical gear shaft 9 through a spline. The output end of the first small conical gear shaft 9 is connected to the first differential 10 through a drive connection. The output end of the small conical connecting shaft 8 is connected to one end of the universal joint drive shaft 11. The other end of the universal joint drive shaft 11 is connected to one end of the second small conical gear shaft 12 through a drive connection. The other end of the second small conical gear shaft 12 is connected to the second differential 13 through a drive connection.

[0079] It should be noted that the first differential 10 mentioned above uses existing technology, and its specific structure and principle will not be described in detail here.

[0080] Example 10

[0081] Based on the above embodiments, this embodiment also provides a tractor, including the power transmission system described above.

[0082] This embodiment provides a tractor with a compact structure. The shuttle shift drive gear shaft and connecting shaft are sleeved on the front section of the power output shaft, and the main transmission input shaft is sleeved on the PTO transmission shaft, which reduces the space occupied by the transmission mechanism. It has the advantages of high transmission efficiency, convenient shifting, multiple gears, and reasonable speed distribution, which can meet the different requirements of various implements for the overall speed, and the axial distance is short.

[0083] The working principle of this utility model is as follows:

[0084] During use, the engine's power is transmitted to the transmission mechanism via the power input component. On one hand, the transmission mechanism transmits part of the power to the rear wheels via the first small bevel gear shaft 9; on the other hand, the transmission mechanism transmits another part of the power to the front wheels via the small bevel connecting shaft 8, the universal joint drive shaft 11, and the second small bevel gear shaft 12, thereby achieving four-wheel drive.

[0085] In addition, part of the engine's power is transmitted to the PTO wet clutch 3 and the PTO input gear shaft 4 via the PTO drive shaft 2, and then to the agricultural implements via the PTO input gear shaft 4, so as to provide power to the agricultural implements and facilitate operation.

[0086] This utility model provides a power transmission system and tractor that can meet the different speed requirements of various implements. Its advantages are: compact structure, with the shuttle shift drive gear shaft and connecting shaft sleeved on the front section of the power output shaft, and the main transmission input shaft sleeved on the PTO transmission shaft, reducing the space occupied by the transmission mechanism. It has the advantages of high transmission efficiency, convenient shifting, multiple gears, and reasonable speed distribution, which can meet the different speed requirements of various implements, and the axial distance is short.

[0087] It should be noted that all electronic components involved in this utility model adopt existing technology, and all the above-mentioned components are electrically connected to the controller, and the control circuit between the controller and each component is existing technology.

[0088] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0089] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0090] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A power transmission system, characterized in that: It includes a power input component, a transmission mechanism, a first small bevel gear shaft (9), a second small bevel gear shaft (12), and a small bevel connecting shaft (8). The power input component is connected to the input end of the transmission mechanism and is used to connect the engine and transmit the engine's power to the transmission mechanism. The input end of the small conical connecting shaft (8) and the input end of the first small conical gear shaft (9) are respectively connected to the output end of the transmission mechanism. The output end of the first small conical gear shaft (9) is used to connect to the rear wheel. The output end of the small conical connecting shaft (8) is connected to the input end of the second small conical gear shaft (12) through the universal joint drive shaft (11). The output end of the second small conical gear shaft (12) is used to connect to the front wheel. The universal joint drive shaft (11) is telescopic.

2. The power transmission system according to claim 1, characterized in that: The transmission mechanism includes a main transmission (14) and a secondary transmission (15). The secondary transmission (15) is fixedly installed on one side of the main transmission (14) and is connected to the main transmission (14) in a transmission. The power input component is connected to the main transmission (14). The input end of the small conical connecting shaft (8) and the input end of the first small conical gear shaft (9) are respectively connected to the secondary transmission (15).

3. The power transmission system according to claim 2, characterized in that: The power input assembly includes a hollow torsion intermediate drive shaft (7) and a main transmission input shaft (6), which pass through the main transmission (14); the output end of the torsion intermediate drive shaft (7) is fixedly connected to the input end of the main transmission input shaft (6).

4. The power transmission system according to claim 3, characterized in that: It also includes a shuttle shift mechanism (18) and a shuttle shift drive gear shaft (5), the output end of which is fixedly connected to the input end of the shuttle shift mechanism (18), and the output end of the shuttle shift mechanism (18) is fixedly connected to the input end of the twisting intermediate transmission shaft (7).

5. The power transmission system according to any one of claims 1-4, characterized in that: It also includes a PTO drive shaft (2), a PTO wet clutch (3) and a PTO input gear shaft (4). The PTO drive shaft (2) passes through the power input assembly and the transmission mechanism, and is connected to the input end of the PTO input gear shaft (4) through the PTO wet clutch (3). The output end of the PTO input gear shaft (4) is used to connect agricultural implements.

6. The power transmission system according to claim 5, characterized in that: It also includes a power output front shaft (1), the output end of which is fixedly connected to the input end of the PTO drive shaft (2), and its input end is used to connect to the engine.

7. The power transmission system according to any one of claims 1-4, characterized in that: The two ends of the universal joint drive shaft (11) are respectively connected to the output end of the small conical connecting shaft (8) and the input end of the second small conical gear shaft (12) through universal joints.

8. The power transmission system according to any one of claims 1-4, characterized in that: It also includes a second differential (13) and a gearbox housing (16), the second differential (13) being mounted on the gearbox housing (16) and connected to the output end of the second small bevel gear shaft (12).

9. The power transmission system according to any one of claims 1-4, characterized in that: It also includes a first differential (10) and a rear axle housing (17), the first differential (10) being mounted on the rear axle housing (17) and connected to the output end of the first small bevel gear shaft (9).

10. A tractor, characterized in that: Including the power transmission system as described in any one of claims 1-9.

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