Hilly land tractor

Abstract

A hilly mountain tractor comprises a segmented chassis, an engine assembly, a hydraulic system and a bidirectional driving operation device assembly, the segmented chassis comprises a front box body and a rear box body, the left and right sides of the front box body are respectively provided with front wheels, the left and right sides of the rear box body are respectively provided with rear wheels, a waist folding and waist twisting device is connected between the front box body and the rear box body, the waist folding and waist twisting device can be used for waist folding and steering, and the front and rear box bodies of the tractor can be twisted and rotated, a seat and a pedal which can be folded are arranged in the bidirectional driving operation device assembly, so that the driving position of the tractor can be rotated by 180 degrees, the bidirectional driving of the tractor is realized by cooperating with a steering hydraulic system, four-wheel braking and front-rear differential lock of the tractor can be controlled by a braking hydraulic system, and the lifting of a suspension device to drive a farm implement can be controlled by a lifting hydraulic system. The tractor can adapt to the complex terrain of hilly mountains, greatly improves the passability of the tractor in hilly mountains, and is beneficial to popularization and application.

Description

Technical Field

[0001] This invention relates to the field of tractors, and more particularly to a hilly and mountainous tractor. Background Technology

[0002] my country's hilly and mountainous areas are characterized by high mountains and steep slopes, narrow and winding roads, small and fragmented fields, and heavy clay soil. More than two-thirds of the arable land is sloping, resulting in a complex variety of crops and cultivation techniques. The harsh working conditions mean that traditional tractors are ill-suited to the terrain, lacking the necessary maneuverability, safety, maneuverability, and comfort. Although my country has recently implemented mechanization reforms to adapt tractors to local conditions and vice versa, addressing the lack of available or suitable tractors, the mechanization rate in tillage, planting, harvesting, and management in hilly and mountainous areas remains very low. The overall mechanization rate for tillage, planting, and harvesting is less than 50%, 20 percentage points lower than the national average. Currently, traditional tractors used in hilly and mountainous areas generally use front-wheel steering, which has a large minimum steering radius and poor steering maneuverability. The terrain in hilly and mountainous areas is complex and the road surface is irregular. Existing tractors have poor passability in hilly and mountainous areas. The whole machine uses rear-wheel braking, which also has poor safety. Moreover, it cannot achieve two-way driving and cannot work in some difficult turning situations. There are no front and rear differential locks, which can easily cause slippage on muddy roads in rainy weather. Summary of the Invention

[0003] The purpose of this invention is to provide a hilly and mountainous tractor that enables the tractor to adapt to the complex terrain of hilly and mountainous areas and improves the tractor's passability in hilly and mountainous areas.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a hilly and mountainous tractor, comprising a segmented chassis, an engine assembly, a hydraulic system, and a two-way driving control device assembly. The segmented chassis includes a front box and a rear box. Front wheels are respectively installed on the left and right sides of the front box, and rear wheels are respectively installed on the left and right sides of the rear box. A slack-to-twist device is connected between the front box and the rear box. The front end of the front box is connected to the engine assembly via a clutch. A hood is provided on the outer side of the front box and the engine assembly. A PTO assembly is provided at the rear end of the rear box, and the PTO assembly is connected to a trailer hitch. Two suspension devices are also connected to the rear end of the rear box, and the two suspension devices are respectively located on the left and right sides of the trailer hitch. The two-way driving control device assembly is installed on the top side of the rear box and can rotate and switch between a forward driving position and a reverse driving position. The hydraulic system includes a steering hydraulic system for controlling the slack-to-twist steering function, a braking hydraulic system for controlling the four-wheel braking function, and a lifting hydraulic system for controlling the suspension devices.

[0005] The front housing has a first and second drive shaft that are parallel to each other at its rear end, and a third and fourth drive shaft that are parallel to each other at its front end. A first universal joint connects the first and third drive shafts, and a second universal joint connects the second and fourth drive shafts. The first universal joint is located above the second universal joint. The waist-folding and twisting device includes a waist-folding outer housing, a waist-twisting inner housing, and two waist-folding cylinders. The waist-twisting inner housing is fixed to the rear end of the front housing. The first and second drive shafts both pass through the waist-twisting inner housing, which is located inside the waist-folding outer housing. A rear housing connecting pin is inserted into the rear housing connecting pin hole of the waist-folding outer housing, and the rear housing connecting pin is also rotatably connected to the rear housing. The two waist-folding cylinders are located on the left and right sides of the rear housing connecting pin, respectively. A waist-folding cylinder has a connecting pin inserted at each end along its length. The front and rear hydraulic cylinder pins are provided. The left and right sides of the folding outer housing are respectively provided with folding cylinder pin holes. The two front hydraulic cylinder pins are respectively inserted into the two folding cylinder pin holes. The two rear hydraulic cylinder pins are respectively rotatably connected to the rear housing. The axes of the rear housing connecting pin, the front hydraulic cylinder pins and the rear hydraulic cylinder pins are all perpendicular to the horizontal direction when the tractor is traveling on a horizontal plane. The steering hydraulic system can control the extension and retraction of the two folding cylinders. The folding outer housing and the twisting inner housing are positioned relative to each other along the axial direction of the first drive shaft. The folding outer housing can rotate relative to the twisting inner housing around the first drive shaft, so that the front housing, the folding outer housing and the twisting inner housing can fold and rotate relative to the rear housing around the rear housing connecting pin, and the front housing and the twisting inner housing can twist and rotate relative to the folding outer housing and the rear housing around the first drive shaft.

[0006] Preferably, a front roll cage is installed on the top side of the front box and a rear roll cage is installed on the top side of the rear box, with the front and rear roll cages located on the front and rear sides of the two-way driving control assembly, respectively.

[0007] Preferably, the bidirectional driving control assembly includes a rotating base mounted on the top side of the rear box. The rotating base is rotatable on the rear box, and its axis is perpendicular to the horizontal direction when the tractor is traveling on a horizontal plane. An operating platform and a seat are mounted on the rotating base. A steering wheel and a control lever are mounted on the operating platform. A foldable clutch pedal is provided on the left side of the operating platform, and a foldable brake pedal is provided on the right side of the operating platform. The bottom ends of both the foldable clutch pedal and the foldable brake pedal can be rotated upwards to a folded position. The seat can rotate around its bottom pivot towards the operating platform to a folded position, so that the seat, the foldable clutch pedal, and the foldable brake pedal can rotate synchronously with the rotating base.

[0008] Preferably, the folding outer housing has two rear housing connecting pin holes, one of which is located above the first universal joint and the other is located below the second universal joint. The axes of the two rear housing connecting pins coincide and both intersect with the axis of the first drive shaft.

[0009] Preferably, the bottom end of the folded outer housing is open, and the inner wall of the folded outer housing can block the outer wall of the twisted inner housing, so as to limit the twisting rotation angle of the twisted inner housing relative to the folded outer housing around the first drive shaft.

[0010] Preferably, the steering hydraulic system includes an oil suction filter, a steering gear pump, a high-pressure filter, a priority valve, a differential lock control valve, and a directional valve. The oil suction filter draws hydraulic oil from the oil tank in the front or rear housing and delivers it to the steering gear pump. The steering gear pump sequentially delivers the hydraulic oil to the high-pressure filter and the priority valve. The priority valve simultaneously delivers the hydraulic oil to the differential lock control valve and the directional valve. The differential lock control valve delivers the hydraulic oil to the front differential lock inlet and the rear differential lock inlet, respectively, for control purposes. The system controls the front and rear differential locks of the tractor; the directional valve delivers hydraulic oil to the two articulated cylinders and the steering return port to control the extension and retraction of the two articulated cylinders and to allow the hydraulic oil to flow back to the oil tank; the directional valve is also connected to the steering gear, and when the two-way driving control assembly is switched between the forward driving position and the reverse driving position, the directional valve can change the flow direction of the hydraulic oil in the steering gear, so that the articulation direction of the tractor controlled by the steering wheel in the forward driving position and the reverse driving position remains consistent.

[0011] Preferably, the brake hydraulic system includes a pedal oil tank, a clutch pump, a brake pump, and a flow divider valve. The pedal oil tank can deliver hydraulic oil to the clutch pump and the brake pump respectively. The clutch pump is connected to a foldable clutch pedal, and when the foldable clutch pedal is rotated, the clutch pump can deliver hydraulic oil to the clutch. The brake pump is connected to a foldable brake pedal, and when the foldable brake pedal is rotated, the brake pump can deliver hydraulic oil to the flow divider valve. The left and right sides of the front housing are respectively provided with a left front brake and a right front brake, and the left and right sides of the rear housing are respectively provided with a left rear brake and a right rear brake. The flow divider valve can deliver hydraulic oil to the left front brake, right front brake, left rear brake, and right rear brake respectively, so as to facilitate simultaneous four-wheel braking of the two front wheels and the two rear wheels.

[0012] Preferably, an electronic brake push rod is installed on the outside of the left front brake. One end of the electronic brake push rod is rotatably connected to the parking brake. The parking brake is sleeved on the first drive shaft. When the electronic brake push rod extends, it can push the parking brake to rotate and lock the first drive shaft, so that the parking brake can restrict the rotation of the first drive shaft and thus achieve parking braking.

[0013] Preferably, the lifting hydraulic system includes a suction filter, a lifting gear pump, a radiator, a hydraulic output valve block, and a hydraulic lifting valve block. The suction filter draws hydraulic oil from the oil tank in the front or rear housing and delivers it to the lifting gear pump. The lifting gear pump simultaneously delivers hydraulic oil to the radiator, the hydraulic output valve block, and the hydraulic lifting valve block. The radiator is installed at the front end of the engine assembly and is connected to the oil tank via a cooling return pipe to cool the engine and allow the hydraulic oil to flow back to the oil tank. The hydraulic output valve block is connected to a hydraulic output pipe and an output control handle. The output control handle controls the flow of hydraulic oil through the hydraulic output pipe to external implements. The hydraulic lifting valve block is connected to a lifting cylinder pipe and a lifting control handle. The lifting control handle controls the flow of hydraulic oil through the lifting cylinder pipe to the lifting cylinder, so that the lifting cylinder can drive the suspension device to move.

[0014] According to the above technical solution, the beneficial effects of the present invention are:

[0015] The hilly and mountainous tractor of this invention can perform folding and turning steering through a folding and twisting device, and can also twist and rotate the front and rear boxes of the tractor. By setting a foldable seat and pedals in the two-way driving control assembly, the driving position of the tractor can be rotated 180 degrees. With the help of the steering hydraulic system, the tractor can be driven in both directions. The braking hydraulic system can control the four-wheel brakes and the front and rear differential locks of the tractor. It can also control the suspension device to lift the implements through the lifting hydraulic system. Therefore, the tractor of this invention can adapt to the complex terrain of hilly and mountainous areas, and can drive smoothly on irregular roads through the folding and twisting function. It can also perform two-way driving, front and rear differential locks and four-wheel braking in situations where it is difficult to turn and easy to slip, which greatly improves the tractor's passability in hilly and mountainous areas and is conducive to its widespread application. Attached Figure Description

[0016] Figure 1 This is a front view of the tractor in a forward driving position.

[0017] Figure 2 A top view of the tractor in a forward-facing driving position;

[0018] Figure 3 A 3D view of a tractor in reverse driving mode;

[0019] Figure 4 This is a diagram of the internal structure of a tractor in a forward-driving state.

[0020] Figure 5 for Figure 4 A magnified view of the right half;

[0021] Figure 6 A schematic diagram showing the connection between the front and rear boxes via a folding and twisting device.

[0022] Figure 7 This is a schematic diagram showing the connection between the front box and the folding and twisting device. Figure 7 Partial sectioning of the middle-waisted outer box body;

[0023] Figure 8 This is a schematic diagram of the two-way driving control device assembly. Figure 8 The image depicts seats in two different positions.

[0024] Figure 9 This is a schematic diagram of the steering hydraulic system;

[0025] Figure 10 This is a schematic diagram of a brake hydraulic system;

[0026] Figure 11 A schematic diagram of the hydraulic system.

[0027] Markings in the diagram: 1. Hood, 2. Engine assembly, 3. Front wheel, 4. Rear wheel, 5. Front roll cage, 6. Rear roll cage, 7. Trailer, 8. Suspension system, 9. Lift cylinder, 10. Control panel, 11. Steering wheel, 12. Control lever, 13. Seat, 14. Foldable clutch pedal, 15. Foldable brake pedal, 16. Front box, 17. Rear box, 18. Left front brake, 19. Right front brake, 20. Left rear brake, 21. Right rear brake, 22. Folding outer box, 23. Clutch, 24. PTO assembly, 25. Folding cylinder, 26. Folding cylinder pin hole, 27. Front cylinder pin, 28. Rear cylinder pin, 29. Rear box connecting pin hole, 30. Rear box connecting pin, 31. Second drive shaft, 32. 33. First universal joint; 34. Second universal joint; 35. Twist waist inner housing; 36. Rotating base; 37. Reversing valve; 38. Steering gear; 39. Suction oil filter; 40. Steering gear pump; 41. High pressure filter; 42. Priority valve; 43. Differential lock control valve; 44. Front differential lock inlet; 45. Rear differential lock inlet; 46. Steering return oil port; 47. Pedal oil tank; 48. Clutch pump; 49. Brake pump; 50. Divider valve; 51. Electronic brake push rod; 52. Parking brake; 53. Lifting gear pump; 54. Radiator; 55. Cooling return oil pipe; 56. Output control handle; 57. Hydraulic output valve block; 58. Hydraulic output pipe; 59. Lifting control handle; 60. Hydraulic lifting valve block; 71. Lifting cylinder pipe. Detailed Implementation

[0028] Referring to the attached diagram, the specific implementation method is as follows:

[0029] like Figure 1-4As shown, a hilly tractor includes a segmented chassis, an engine assembly 2, a hydraulic system, and a two-way driving control assembly. The segmented chassis includes a front box 16 and a rear box 17. Front wheels 3 are installed on the left and right sides of the front box 16, and rear wheels 4 are installed on the left and right sides of the rear box 17. A folding and twisting device is connected between the front box 16 and the rear box 17. The front end of the front box 16 is connected to the engine assembly 2 via a clutch 23. A cover 1 is provided on the outer side of the front box 16 and the engine assembly 2. A PTO assembly 24 is provided at the rear end of the rear box 17. The PTO assembly 24 is connected to a trailer hitch 7. Two suspension devices 8 are also connected to the rear end of the rear box 17. The two suspension devices 8 are located on the left and right sides of the trailer hitch 7, respectively.

[0030] like Figure 1-3 As shown, the two-way driving control assembly is mounted on the top side of the rear box 17. The assembly can rotate and switch between a forward driving position and a reverse driving position. A front roll cage 5 is mounted on the top side of the front box 16, and a rear roll cage 6 is mounted on the top side of the rear box 17. The front and rear roll cages 5 and 6 are located on the front and rear sides of the two-way driving control assembly, respectively. The hydraulic system includes a steering hydraulic system for controlling the swerve steering function, a brake hydraulic system for controlling the four-wheel braking function, and a lifting hydraulic system for controlling the suspension device 8. The hydraulic system's oil tank is installed inside either the front box 16 or the rear box 17.

[0031] like Figure 7 As shown, the rear end of the front housing 16 is provided with a first drive shaft and a second drive shaft 31 that are parallel to each other, and the front end of the rear housing 17 is provided with a third drive shaft and a fourth drive shaft that are parallel to each other. A first universal joint 32 is connected between the first drive shaft and the third drive shaft, and a second universal joint 33 is connected between the second drive shaft 31 and the fourth drive shaft. The first universal joint 32 is located above the second universal joint 33.

[0032] The waist-folding and twisting device includes a waist-folding outer housing 22, a waist-twisting inner housing 34, and two waist-folding cylinders 25. The waist-twisting inner housing 34 is fixed to the rear end of the front housing 16. The first drive shaft and the second drive shaft 31 both pass through the waist-twisting inner housing 34. The waist-twisting inner housing 34 is located inside the waist-folding outer housing 22. A rear housing connecting pin 30 is inserted into the rear housing connecting pin hole 29 of the waist-folding outer housing 22. The rear housing connecting pin 30 is also rotatably connected to the rear housing 17. The two waist-folding cylinders 25 are located on the left and right sides of the rear housing connecting pin 30, respectively.

[0033] like Figure 9As shown, the two ends of the folding cylinder 25 along its length are respectively provided with a front cylinder pin 27 and a rear cylinder pin 28. The left and right sides of the folding outer box 22 are respectively provided with folding cylinder pin holes 26. The two front cylinder pins 27 are respectively inserted into the two folding cylinder pin holes 26. The two rear cylinder pins 28 are respectively rotatably connected to the rear box 17. The axes of the rear box connecting pin 30, the front cylinder pins 27 and the rear cylinder pins 28 are all perpendicular to the horizontal direction when the tractor is traveling on a horizontal plane.

[0034] The steering hydraulic system can control the extension and retraction of the two folding cylinders 25. The folding outer box 22 and the twisting inner box 34 are positioned relative to each other along the axial direction of the first drive shaft, and the folding outer box 22 can rotate around the first drive shaft relative to the twisting inner box 34. This allows the front box 16, the folding outer box 22, and the twisting inner box 34 to fold and rotate relative to the rear box 17 around the rear box connecting pin 30, and the front box 16 and the twisting inner box 34 to twist and rotate around the first drive shaft relative to the folding outer box 22 and the rear box 17. This allows the tractor to adapt to the complex terrain of hilly and mountainous areas and to drive smoothly on irregular roads through the folding and twisting function.

[0035] In this embodiment, the folding outer housing 22 has two rear housing connecting pin holes 29. One rear housing connecting pin hole 29 is located above the first universal joint 32, and the other rear housing connecting pin hole 29 is located below the second universal joint 33. The axes of the two rear housing connecting pins 30 coincide and both intersect the axis of the first drive shaft. The bottom end of the folding outer housing 22 is open, and the inner wall of the folding outer housing 22 can block the outer wall of the twisting inner housing 34, thus limiting the twisting rotation angle of the twisting inner housing 34 relative to the folding outer housing 22 to no more than ±15 degrees when it rotates around the first drive shaft.

[0036] like Figure 8 As shown, the two-way driving control assembly includes a rotating base 35 mounted on the top side of the rear box 17. The rotating base 35 is rotatable on the rear box 17, and its axis is perpendicular to the horizontal direction when the tractor is traveling on a horizontal plane. Figure 1-6 As shown, an operating platform 10 and a seat 13 are mounted on the rotating base 35. A steering wheel 11 and a control lever 12 are mounted on the operating platform 10. A foldable clutch pedal 14 is provided on the left side of the operating platform 10, and a foldable brake pedal 15 is provided on the right side of the operating platform 10. The bottom ends of the foldable clutch pedal 14 and the foldable brake pedal 15 can be rotated upwards to the folded position. The seat 13 can rotate around its bottom pivot towards the operating platform 10 to the folded position. At this time, the seat 13, the foldable clutch pedal 14, and the foldable brake pedal 15 can rotate synchronously with the rotating base 35 without interference, realizing bidirectional driving of the tractor.

[0037] like Figure 9 As shown, the steering hydraulic system includes an oil suction filter 38, a steering gear pump 39, a high-pressure filter 40, a priority valve 41, a differential lock control valve 42, and a reversing valve 36. The oil suction filter 38 can draw hydraulic oil from the oil tank of the front housing 16 or the rear housing 17 and deliver it to the steering gear pump 39. The steering gear pump 39 can deliver the hydraulic oil to the high-pressure filter 40 and the priority valve 41 in sequence. The priority valve 41 can deliver the hydraulic oil to the differential lock control valve 42 and the reversing valve 36 at the same time. The differential lock control valve 42 can deliver the hydraulic oil to the front differential lock inlet 43 and the rear differential lock inlet 44 respectively, thereby controlling the front and rear differential locks of the tractor.

[0038] like Figure 9 As shown, the directional valve 36 can deliver hydraulic oil to the two sway cylinders 25 and the steering return port 45 respectively, thereby controlling the extension and retraction of the two sway cylinders 25 and allowing excess hydraulic oil in the steering hydraulic system to flow back to the oil tank. The directional valve 36 is also connected to the steering gear 37. When the two-way driving control assembly rotates between the forward driving position and the reverse driving position, the directional valve 36 can change the flow direction of the hydraulic oil in the steering gear 37, so that the tractor sway direction controlled by the steering wheel 11 in the forward driving position and the reverse driving position remains consistent.

[0039] like Figure 5 , 6 As shown in Figure 10, the brake hydraulic system includes a pedal oil tank 46, a clutch pump 47, a brake pump 48, and a flow divider valve 49. The pedal oil tank 46 can deliver hydraulic oil to the clutch pump 47 and the brake pump 48 respectively. The clutch pump 47 is connected to the foldable clutch pedal 14. When the foldable clutch pedal 14 is rotated, the clutch pump 47 can deliver hydraulic oil to the clutch 23.

[0040] like Figure 4 , 6 As shown in Figure 10, the brake pump 48 is connected to the foldable brake pedal 15. When the foldable brake pedal 15 is rotated, the brake pump 48 can deliver hydraulic oil to the flow divider valve 49. The left front brake 18 and the right front brake 19 are respectively provided on the left and right sides of the front housing 16, and the left rear brake 20 and the right rear brake 21 are respectively provided on the left and right sides of the rear housing 17. The flow divider valve 49 can deliver hydraulic oil to the left front brake 18, the right front brake 19, the left rear brake 20 and the right rear brake 21 respectively, so that the two front wheels 3 and the two rear wheels 4 can be braked simultaneously.

[0041] like Figure 10As shown, an electronic brake push rod 50 is installed on the outside of the left front brake 18. One end of the electronic brake push rod 50 is rotatably connected to the parking brake 51. The parking brake 51 is sleeved on the first drive shaft. When the electronic brake push rod 50 extends, it can push the parking brake 51 to rotate and lock the first drive shaft. The parking brake 51 can then restrict the rotation of the first drive shaft, thereby achieving parking braking.

[0042] like Figure 11 As shown, the lifting hydraulic system includes a suction filter 38, a lifting gear pump 52, a radiator 53, a hydraulic output valve block 56, and a hydraulic lifting valve block 59. The suction filter 38 can draw hydraulic oil from the oil tank of the front housing 16 or the rear housing 17 and deliver it to the lifting gear pump 52. The lifting gear pump 52 can simultaneously deliver hydraulic oil to the radiator 53, the hydraulic output valve block 56, and the hydraulic lifting valve block 59. The radiator 53 is installed at the front end of the engine assembly 2 and is connected to the oil tank through a cooling return oil pipe 54 to facilitate cooling of the engine and allow excess hydraulic oil in the lifting hydraulic system to flow back to the oil tank.

[0043] like Figure 11 As shown, the hydraulic output valve block 56 is connected to a hydraulic output pipe 57 and an output control handle 55. The output control handle 55 can control the flow of hydraulic oil through the hydraulic output pipe 57 to the external implement, providing power to the implement. The hydraulic lifting valve block 59 is connected to a lifting cylinder pipe 60 and a lifting control handle 58. The lifting control handle 58 can control the flow of hydraulic oil through the lifting cylinder pipe 60 to the lifting cylinder 9. When the lifting cylinder 9 extends or retracts, it can drive the suspension device 8 to move, thereby lifting the agricultural implement.

Claims

1. A hilly and mountainous tractor, characterized in that: The system includes a segmented chassis, an engine assembly (2), a hydraulic system, and a two-way driving control assembly. The segmented chassis includes a front box (16) and a rear box (17). Front wheels (3) are installed on the left and right sides of the front box (16), and rear wheels (4) are installed on the left and right sides of the rear box (17). A folding and twisting device is connected between the front box (16) and the rear box (17). The front end of the front box (16) is connected to the engine assembly (2) via a clutch (23). The outer sides of the front box (16) and the engine assembly (2) are covered with engine covers (1), and the rear end of the rear box (17) is provided with a P-type engine cover. The TO assembly (24) and PTO assembly (24) are connected to the trailer (7). The rear end of the rear box (17) is also connected to two suspension devices (8), which are located on the left and right sides of the trailer (7). The two-way driving operation device assembly is installed on the top side of the rear box (17). The two-way driving operation device assembly can rotate and switch between the forward driving position and the reverse driving position. The hydraulic system includes a steering hydraulic system for controlling the folding steering function, a braking hydraulic system for controlling the four-wheel braking function, and a lifting hydraulic system for controlling the suspension devices (8). The rear end of the front housing (16) is provided with a first drive shaft and a second drive shaft (31) that are parallel to each other, and the front end of the rear housing (17) is provided with a third drive shaft and a fourth drive shaft that are parallel to each other. A first universal joint (32) is connected between the first drive shaft and the third drive shaft, and a second universal joint (33) is connected between the second drive shaft (31) and the fourth drive shaft. The first universal joint (32) is located above the second universal joint (33). The waist-folding and waist-twisting device includes a waist-folding outer housing (22), a waist-twisting inner housing (34), and two waist-folding cylinders (25). The inner box (34) is fixed to the rear end of the front box (16). The first drive shaft and the second drive shaft (31) both pass through the inner box (34). The inner box (34) is located inside the outer box (22). The rear box connecting pin (30) is inserted into the rear box connecting pin hole (29) of the outer box (22). The rear box connecting pin (30) is also rotatably connected to the rear box (17). Two folding cylinders (25) are located on the left and right sides of the rear box connecting pin (30). The two ends of the folding cylinders (25) along the length direction are respectively inserted with The front cylinder pin (27) and the rear cylinder pin (28) are respectively provided with cylinder pin holes (26) on the left and right sides of the folding outer box (22). The two front cylinder pins (27) are respectively inserted into the two cylinder pin holes (26), and the two rear cylinder pins (28) are respectively rotatably connected to the rear box (17). The axes of the rear box connecting pin (30), the front cylinder pins (27) and the rear cylinder pins (28) are all perpendicular to the horizontal direction when the tractor is traveling on a horizontal plane. The steering hydraulic system can control the extension of the two folding cylinders (25). The contraction motion causes the outer box (22) and the inner box (34) to be positioned relative to each other along the axial direction of the first drive shaft. The outer box (22) can rotate relative to the inner box (34) around the first drive shaft, thereby enabling the front box (16), the outer box (22), and the inner box (34) to rotate relative to the rear box (17) around the rear box connecting pin (30), and enabling the front box (16) and the inner box (34) to rotate relative to the outer box (22) and the rear box (17) around the first drive shaft.

2. The hilly and mountainous tractor according to claim 1, characterized in that: A front roll cage (5) is installed on the top side of the front box (16), and a rear roll cage (6) is installed on the top side of the rear box (17). The front roll cage (5) and the rear roll cage (6) are located on the front and rear sides of the two-way driving control assembly, respectively.

3. A hilly and mountainous tractor according to claim 1, characterized in that: The bidirectional driving control assembly includes a rotating base (35) mounted on the top side of the rear box (17). The rotating base (35) can rotate on the rear box (17). The axis of the rotating base (35) is perpendicular to the horizontal direction when the tractor is traveling on a horizontal plane. An operating table (10) and a seat (13) are mounted on the rotating base (35). A steering wheel (11) and an operating lever (12) are mounted on the operating table (10). A foldable clutch pedal (14) is provided on the left side of the operating table (10), and a foldable brake pedal (15) is provided on the right side of the operating table (10). The bottom ends of the foldable clutch pedal (14) and the foldable brake pedal (15) can be rotated upward to the folded position. The seat (13) can rotate around its bottom pivot toward the operating table (10) to the folded position so that the seat (13), the foldable clutch pedal (14) and the foldable brake pedal (15) can rotate synchronously with the rotating base (35).

4. A hilly and mountainous tractor according to claim 1, characterized in that: Two rear box connecting pin holes (29) are provided on the folding outer box body (22). One rear box connecting pin hole (29) is located above the first universal joint (32), and the other rear box connecting pin hole (29) is located below the second universal joint (33). The axes of the two rear box connecting pins (30) coincide and both intersect with the axis of the first drive shaft.

5. A hilly and mountainous tractor according to claim 1, characterized in that: The bottom end of the folded outer box (22) is open, and the inner wall of the folded outer box (22) can block the outer wall of the twisted inner box (34) so ​​as to limit the twisted rotation angle of the twisted inner box (34) relative to the folded outer box (22) around the first drive shaft.

6. A hilly and mountainous tractor according to claim 1, characterized in that: The steering hydraulic system includes an oil suction filter (38), a steering gear pump (39), a high-pressure filter (40), a priority valve (41), a differential lock control valve (42), and a directional valve (36). The oil suction filter (38) can draw hydraulic oil from the oil tank in the front housing (16) or the rear housing (17) and deliver it to the steering gear pump (39). The steering gear pump (39) can deliver hydraulic oil sequentially to the high-pressure filter (40) and the priority valve (41). The priority valve (41) can deliver hydraulic oil simultaneously to the differential lock control valve (42) and the directional valve (36). The differential lock control valve (42) can deliver hydraulic oil to the front differential lock inlet (43) and the directional valve (36). The front differential lock and rear differential lock inlet (44) are connected to the steering gear (37). The steering gear (11) controls the front differential lock and rear differential lock of the tractor. The reversing valve (36) can deliver hydraulic oil to the two slewing cylinders (25) and the steering return port (45) respectively, so as to control the extension and retraction of the two slewing cylinders (25) and make the hydraulic oil flow back to the oil tank. The reversing valve (36) is also connected to the steering gear (37). When the two-way driving operation device assembly is rotated and switched between the forward driving position and the reverse driving position, the reversing valve (36) can change the flow direction of the hydraulic oil in the steering gear (37), so that the tractor slewing direction controlled by the steering wheel (11) in the forward driving position and the reverse driving position are consistent.

7. A hilly and mountainous tractor according to claim 1, characterized in that: The brake hydraulic system includes a pedal oil tank (46), a clutch pump (47), a brake pump (48), and a flow divider valve (49). The pedal oil tank (46) can deliver hydraulic oil to the clutch pump (47) and the brake pump (48) respectively. The clutch pump (47) is connected to a foldable clutch pedal (14), and when the foldable clutch pedal (14) is rotated, the clutch pump (47) can deliver hydraulic oil to the clutch (23). The brake pump (48) is connected to a foldable brake pedal (15), and when the foldable brake pedal (15) is rotated, it can deliver hydraulic oil to the clutch (23). The brake pump (48) delivers hydraulic oil to the flow divider valve (49). The left front brake (18) and right front brake (19) are respectively provided on the left and right sides of the front housing (16), and the left rear brake (20) and right rear brake (21) are respectively provided on the left and right sides of the rear housing (17). The flow divider valve (49) can deliver hydraulic oil to the left front brake (18), right front brake (19), left rear brake (20) and right rear brake (21) respectively, so as to perform four-wheel braking on the two front wheels (3) and the two rear wheels (4) at the same time.

8. A hilly and mountainous tractor according to claim 7, characterized in that: An electronic brake push rod (50) is installed on the outside of the left front brake (18). One end of the electronic brake push rod (50) is rotatably connected to the parking brake (51). The parking brake (51) is sleeved on the first drive shaft. When the electronic brake push rod (50) extends, it can push the parking brake (51) to rotate and lock the first drive shaft, so that the parking brake (51) can restrict the rotation of the first drive shaft and thus realize parking braking.

9. A hilly and mountainous tractor according to claim 1, characterized in that: The lifting hydraulic system includes a suction filter (38), a lifting gear pump (52), a radiator (53), a hydraulic output valve block (56), and a hydraulic lifting valve block (59). The suction filter (38) can draw hydraulic oil from the oil tank in the front housing (16) or the rear housing (17) and deliver it to the lifting gear pump (52). The lifting gear pump (52) can simultaneously deliver hydraulic oil to the radiator (53), the hydraulic output valve block (56), and the hydraulic lifting valve block (59). The radiator (53) is installed at the front end of the engine assembly (2). The radiator (53) is connected to the cooling return oil pipe ( 54) Connected to the oil tank to facilitate engine cooling and return of hydraulic oil to the oil tank; the hydraulic output valve block (56) is connected to the hydraulic output pipe (57) and the output control handle (55), which can control the hydraulic oil to flow to the external tool through the hydraulic output pipe (57); the hydraulic lifting valve block (59) is connected to the lifting cylinder pipe (60) and the lifting control handle (58), which can control the hydraulic oil to flow to the lifting cylinder (9) through the lifting cylinder pipe (60), so that the lifting cylinder (9) can drive the suspension device (8) to move.

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