Small and medium power bowing steering tractor

Abstract

The utility model relates to the technical field of tractors, in particular to a small and medium power bowing steering tractor which comprises a chassis, a front rack assembly, a front driving wheel, a rear driving wheel, a steering system assembly, a suspension assembly and a hydraulic lifting pipeline system assembly. The chassis comprises a tail end assembly, and an engine and accessory assembly thereof, a front box and waist bending and twisting assembly and a rear box assembly which are sequentially connected from front to back; the front box and waist-bending and waist-twisting assembly comprises a front box, a waist-bending shell, a waist-bending pin shaft, a waist-twisting outer shell, a waist-twisting inner shell, a reversing shell, a first bolt, a lining, a clamping spring, a second bolt, a third bolt, a clamping spring protection cover and a fourth bolt. The multifunctional tractor can be used for operation in hilly and mountainous areas, integrates common operations such as field cultivation, orchard operation and road transportation, is good in maneuverability, high in safety, high in stability and high in adaptability, and can realize multiple functions of the tractor.

Description

Technical Field

[0001] The utility model relates to the technical field of tractors, in particular to a medium and small power articulated steering tractor. Background Technique

[0002] The steering mode of traditional medium and small power tractors in China is front-wheel steering. Due to the limitations of wheelbase and maximum steering angle, its minimum turning radius is relatively large and its maneuverability is poor. In some special operation areas, such as hilly mountainous areas, orchards and greenhouses, where the operation plot area is small and the crop varieties and cultivation agronomy are complex, due to the harsh operation conditions, the operation efficiency of traditional medium and small power tractors is low, and it is difficult to adapt to the operation conditions in terms of maneuverability and operation comfort. The articulated steering tractor can greatly reduce the turning radius and improve the maneuverability of the whole machine. Therefore, developing a medium and small power articulated steering tractor that can adapt to more operation environments has high practical value and economic significance. Content of the Utility Model

[0003] Aiming at the problems pointed out in the background technique, the purpose of the utility model is to provide a medium and small power articulated steering tractor to solve the problems of poor maneuverability, safety and stability of existing traditional medium and small power tractors; the utility model can take into account ordinary field tillage, road transportation and orchard operations, has multiple functions, is equipped with corresponding agricultural machinery, and can perform operations such as rotary tillage, ploughing, sowing, ditch digging and transportation, and is also applicable to other fixed operations with power output as the main operation mode.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A medium and small power folding steering tractor, comprising a chassis, a front frame assembly, front drive wheels, rear drive wheels, a steering system assembly, a suspension assembly and a hydraulic lift pipeline system assembly. The chassis includes an end assembly and an engine and its accessory assembly, a front box and a folding and twisting assembly, and a rear box assembly that are connected in sequence from front to back. The end assembly includes a front left end, a front right end, a rear left end and a rear right end. The front left end and the front right end are respectively connected to the left and right sides of the front box and the folding and twisting assembly. The rear left end and the rear right end are respectively connected to the two sides of the rear box assembly. The front drive wheels include a front left drive wheel and a front right drive wheel. The front left drive wheel is connected to the front left end, and the front right drive wheel is connected to the front right end. The rear drive wheels include a rear left drive wheel and a rear right drive wheel. The rear left drive wheel is connected to the rear left end, and the rear right drive wheel is connected to the rear right end. The front frame assembly is fixedly connected to the front of the engine and its accessory assembly. A fuel tank assembly is connected to the upper part of the front box and the folding and twisting assembly. A lift assembly is connected to the rear end of the rear box assembly. A seat assembly is connected to the upper part of the rear box assembly. The hydraulic lift pipeline system assembly is respectively connected to the front box and the folding and twisting assembly, the engine and its accessory assembly, the steering system assembly, the end assembly and the lift assembly. The steering system assembly is also connected to the front box and the folding and twisting assembly.

[0006] The front box and the folding and twisting assembly include a front box, a folding housing, a folding pin shaft, a twisting outer housing, a twisting inner housing, a reversing housing, a first bolt, a bushing, a snap ring, a second bolt, a third bolt, a snap ring protective cover and a fourth bolt. The folding housing is fixed to the rear of the front box through the third bolt. The twisting outer housing is connected to the folding housing through the folding pin shaft. The folding pin shaft is fixed to the twisting outer housing through the second bolt. The bushing is installed between the twisting outer housing and the twisting inner housing. The twisting outer housing is installed outside the twisting inner housing. The front end of the twisting inner housing is limited by a snap ring between the inner wall of the twisting outer housing. The snap ring protective cover is fixed to the twisting inner housing through the fourth bolt. The twisting inner housing is fixed to the reversing housing through the first bolt. The reversing housing is connected to the rear box assembly through bolts. The engine and its accessory assembly are connected to the front box. The hydraulic lift pipeline system assembly is respectively connected to the front box, the engine and its accessory assembly, the steering system assembly, the rear right end and the lift assembly. The steering system assembly is respectively connected to the front box and the twisting outer housing.

[0007] The hydraulic lifting pipeline system assembly includes a gear pump, a suction oil pipe, a high-pressure hard pipe, a suction oil filter, a priority valve, a valve block return oil pipe, a high-pressure hose, a hydraulic output valve block, a lifting control handle, a hydraulic output control handle, a lifting cylinder oil pipe, and a hydraulic output joint; the gear pump is fixed on the engine and its accessory assembly, the front end of the suction oil pipe is connected to the lifting gear pump, the rear end of the suction oil pipe is connected to the suction oil filter, the suction oil filter is fixed on the engine and its accessory assembly, the front end of the suction oil filter is connected to the suction oil pipe, and the rear end is connected to the front box. The front end of the high-pressure hard pipe is connected to the gear pump, and the rear end of the high-pressure hard pipe is connected to the priority valve. The priority valve is fixed on the engine and its accessory assembly. The front end of the high-pressure hose is connected to the priority valve, and the rear end of the high-pressure hose is connected to the hydraulic output valve block. The hydraulic output valve block is fixedly connected to the rear right end. The lifting control handle is fixed on the hydraulic output valve block, and the hydraulic output control handle is fixed on the hydraulic output valve block. One end of the lifting cylinder oil pipe is connected to the hydraulic output valve block, and the rear end of the lifting cylinder oil pipe is connected to the lift assembly; the hydraulic output joint is connected to the hydraulic output valve block; one end of the valve block return oil pipe is connected to the hydraulic output valve block, and the other end is connected to the front box; the steering system assembly has a steering gear inlet pipe, and the priority valve is connected to the front end of the steering gear inlet pipe through a hollow bolt.

[0008] The lift assembly includes a reminder bracket and a lifting cylinder, and the rear end of the lifting cylinder oil pipe is connected to the lifting cylinder.

[0009] The twisting waist housing is connected with a rear instrument cover assembly, and the rear instrument cover assembly is connected with an electrical system assembly; the steering system assembly includes a steering wheel, a steering gear, a double-acting steering cylinder, a steering gear inlet pipe, a steering return oil pipe, a steering cylinder inlet pipe, a front welding bracket, and a rear welding bracket; the front end of the steering gear inlet pipe is connected to the hydraulic lifting pipeline system assembly, and the rear end is connected to the steering gear through bolts. The front welding bracket is fixed on the front box through bolts, and the rear welding bracket is connected to the upper part of the twisting waist housing through bolts; the steering wheel and the steering gear are fixed on the rear instrument cover assembly through bolts. One end of the double-acting steering cylinder is connected to the front welding bracket through bolts, and the other end is connected to the rear welding bracket through bolts. One end of the steering cylinder inlet pipe is connected to the double-acting steering cylinder, and the other end is connected to the steering gear. One end of the steering return oil pipe is connected to the steering gear, and the other end is connected to the upper part of the front box.

[0010] The suspension assembly is respectively connected to the rear left end, the rear right end, and the lift assembly.

[0011] The seat assembly is connected to the rear box assembly through the bottom plate assembly. The bottom plate assembly is connected to the upper part and the left and right sides of the rear box assembly, and the lower part of the seat assembly is connected to the upper part of the bottom plate assembly. The bottom plate assembly is connected with a rear mudguard assembly, which includes a left rear mudguard and a right rear mudguard. The lower part of the left rear mudguard is connected to the rear left end, and the upper part is connected to the left side of the bottom of the bottom plate assembly. The lower part of the right rear mudguard is connected to the rear right end, and the upper part is connected to the right side of the bottom of the bottom plate assembly.

[0012] The front left end and the front right end are jointly connected with a front roll bar. The left and right sides of the front roll bar are respectively connected with a front left mudguard and a front right mudguard. The upper part of the lift assembly is connected with a rear roll bar.

[0013] The front hood assembly is connected to the front frame assembly. The front end of the front hood assembly is connected to the front frame assembly through a pin shaft, and the rear end is lapped on the front part of the fuel tank assembly.

[0014] It also includes an air brake device, a towing assembly, a braking assembly and a clutch assembly.

[0015] The beneficial effects of the present utility model are as follows: The present utility model can operate in hilly and mountainous areas, taking into account ordinary field tillage, orchard operations, road transportation and other operations. It has good mobility, high safety, strong stability, strong adaptability, can realize multiple functions of the tractor, and can be equipped with corresponding agricultural implements to carry out operations such as rotary tillage, plowing, sowing, ditch digging and transportation. It is also suitable for other fixed operations with power output as the main operation mode; at the same time, it can also be used for operations such as rotary tillage, weeding, ditch digging and spraying in some mountain orchards. Brief Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0017] Figure 2 It is a top view of the overall structure of the present utility model.

[0018] Figure 3 It is a schematic diagram of the chassis structure of the present utility model.

[0019] Figure 4 It is a schematic diagram of the structure of the front box and the folding and twisting waist assembly of the present utility model.

[0020] Figure 5 It is a schematic diagram of the structure of the steering system assembly of the present utility model.

[0021] Figure 6 It is a schematic diagram of the structure of the hydraulic lift pipeline system assembly of the present utility model.

[0022] In the figure: 1 - Front hood assembly, 2 - Front frame assembly, 3 - Engine and its accessory assembly, 4 - Front drive wheel, 5 - Front box and folding and swiveling assembly, 6 - Rear drive wheel, 7 - Rear fender assembly, 8 - Air brake device, 10 - Steering system assembly, 11 - Fuel tank assembly, 13 - Suspension assembly, 14 - Trailer hitch assembly, 15 - Hydraulic lift pipeline system assembly, 16 - Floor plate assembly, 17 - Brake assembly, 18 - Clutch assembly, 20 - Rear box assembly, 21 - Lifter assembly, 22 - Rear instrument hood assembly, 23 - Electrical system assembly, 24 - Seat assembly;

[0023] 4.1 - Front left drive wheel, 4.2 - Front right drive wheel;

[0024] 5.1 - Front box, 5.2 - Folding housing, 5.3 - Folding pin, 5.4 - Swiveling outer housing, 5.5 - Swiveling inner housing, 5.6 - Reversing housing, 5.7 - First bolt, 5.8 - Bushing 5.8, 5.9 - Snap ring 5.9, 5.10 - Second bolt, 5.11 - Third bolt, 5.12 - Snap ring protective cover, 5.13 - Fourth bolt;

[0025] 6.1 - Rear left drive wheel, 6.2 - Rear right drive wheel;

[0026] 7.1 - Left rear fender, 7.2 - Right rear fender;

[0027] 9.1 - Rear roll bar, 9.2 - Front roll bar;

[0028] 10.1 - Steering wheel, 10.2 - Steering gear, 10.3 - Double-acting steering cylinder, 10.4 - Front welding bracket, 10.5 - Steering gear inlet pipe, 10.6 - Steering return pipe, 10.7 - Steering cylinder inlet pipe, 10.9 - Rear welding bracket;

[0029] 12.1 - Front left fender, 12.2 - Front right fender;

[0030] 15.1 - Gear pump, 15.2 - High-pressure rigid pipe, 15.3 - Suction pipe, 15.4 - Suction filter, 15.5 - Priority valve, 15.6 - Valve block return pipe, 15.7 - Lift control handle, 15.8 - Lift cylinder oil pipe, 15.9 - High-pressure hose, 15.10 - Hydraulic output valve block, 15.11 - Hydraulic output joint, 15.12 - Hydraulic output control handle;

[0031] 19.1 - Front left end, 19.2 - Front right end, 19.3 - Rear left end, 19.4 - Rear right end;

[0032] 21.1 - Lifter bracket, 21.2 - Lift cylinder. Detailed implementation method

[0033] The present invention will be further described in detail below with reference to the accompanying drawings of the specification and specific embodiments.

[0034] Such as Figures 1 - 3As shown in the figure, the invention provides a medium and small power folding-steering tractor, which includes: a front hood assembly 1, a front frame assembly 2, an engine and its accessory assembly 3, front drive wheels 4 (including a front left drive wheel 4.1 and a front right drive wheel 4.2), a front box and folding-twisting assembly 5, rear drive wheels 6 (including a rear left drive wheel 6.1 and a rear right drive wheel 6.2), a rear fender assembly 7 (including a left rear fender 7.1 and a right rear fender 7.2), an air brake device 8, a rear roll bar 9.1, a front roll bar 9.2, a steering system assembly 10, a fuel tank assembly 11, a front fender assembly (including a front left fender 12.1 and a front right fender 12.2), a seat assembly 24, a suspension assembly 13, a towing assembly 14, a hydraulic lift pipeline system assembly 15, a bottom plate assembly 16, a brake assembly 17, a clutch assembly 18, an end assembly (including a front left end 19.1, a front right end 19.2, a rear left end 19.3, and a rear right end 19.4), a rear box assembly 20, a lift assembly 21 (including a lift bracket 21.1 and a lift cylinder 21.2), a rear instrument cover assembly 22, and an electrical system assembly 23; the engine and its accessory assembly 3, the front box and folding-twisting assembly 5, and the rear box assembly 20 are sequentially and firmly connected by connectors from front to back, and form the whole machine chassis with the end assembly; the clutch assembly 18 and the brake assembly 17 are installed on the chassis; the front frame assembly 2 is firmly fixed to the front part of the engine and its accessory assembly 3 by bolt A, the front end of the front hood assembly 1 is connected to the front frame assembly 2 by a pin shaft, and the rear end is lapped on the front part of the fuel tank assembly 11; the front left drive wheel 4.1 is connected to the front left end 19.1 by bolt B, the front right drive wheel 4.2 is connected to the front right end 19.2 by bolt C, the rear left drive wheel 6.1 is connected to the rear left end 19.3 by bolt D, the rear right drive wheel 6.2 is connected to the rear right end 19.4 by bolt E, the fuel tank assembly 11 is connected to the upper part of the front box and folding-twisting assembly 5 by bolt G, the front roll bar 9.2 is connected to the front left end 19.1 and the front right end 19.2 by bolt H and bolt I, the rear roll bar 9.1 is connected to the upper part of the lift assembly 21 by bolt J, the front left fender 12.1 and the front right fender 12.2 are connected to the roll bar 9.2 by bolt K and bolt L, the bottom plate assembly 16 is connected to the left and right sides of the rear box assembly 20 by bolt M, the lower part of the left rear fender 6.1 is connected to the rear left end 19.3 by bolt N, and the upper part is connected to the bottom plate assembly 16 by bolt O; the lower part of the right rear fender 6.2 is connected to the rear right end 19.4 by bolt P, and the upper part is connected to the bottom plate assembly 16 by bolt Q. The rear instrument cover assembly 22 is connected to the front box and folding-twisting assembly 5.5 by bolt R, the suspension assembly 13 is connected to the lift assembly 21 and the rear left end 19.3 and the rear right end 19.4 by bolt S, the electrical system assembly 23 is connected to the rear instrument cover assembly 22 by bolt T, and its wiring harness is arranged at corresponding positions according to the whole machine layout; the lower part of the seat assembly 24 is connected to the upper part of the bottom plate assembly 16 by bolt U.The steering wheel 10.1 and the steering gear 10.2 of the steering system assembly 10 are connected to the rear instrument panel assembly 22 by bolts V. The front welding bracket 10.4 of the steering system assembly 10 is fixed to the front box and the folding and waist-twisting assembly 5.1 by bolts W, and the rear welding bracket 10.9 of the steering system assembly 10 is fixed to the front box and the folding and waist-twisting assembly 5.4 by bolts X. The towing assembly 14 is connected to the lift assembly 21 by bolts Y.

[0035] The specific implementation process of the power function of the whole vehicle of the folding-steering tractor provided by the present utility model is as follows. The engine and its accessory assembly 3, the front box and the folding and waist-twisting assembly 5, the rear box assembly 20 and the end assembly form the main part of the chassis of the hilly and mountain tractor. The clutch assembly 18 and the brake assembly 17 are installed on the chassis. The power is input from the engine and its accessory assembly 3 and output by the end assembly, realizing the input and output of the driving power of the folding-steering tractor and the power input and cut-off of the suspended implement, and also realizing the output of the forward and reverse speeds of the whole vehicle. At the same time, the front and rear wheel brakes of the folding-steering tractor are realized. In addition, the four-wheel drive function of the whole machine is realized to meet the needs of heavy-load operations or working on wet and soft ground. The combination of the towing assembly 14 and the air brake device 8 can realize the connection of the tractor to the trailer on the hilly and mountain areas and realize the transportation function and the braking function of the trailer. The combined use of the suspension assembly 13, the lift assembly 21 and the hydraulic lift pipeline system assembly 15 can realize the operations of the rear suspended implements, such as rotary tillage, mowing, rear excavation, rear snow removal, spraying, etc. The combination of the steering system assembly 10 and the front box and the folding and waist-twisting assembly 5 can easily meet the requirements of realizing the folding-steering and waist-twisting functions of the tractor on the hilly and mountain areas, and can realize the best turning circle radius, realizing the flexibility and mobility of the whole vehicle. The combination of the front hood assembly 1, the fuel tank assembly 11, the front fender assembly 12, the rear fender assembly 7 and the floor assembly 16 realizes the beautiful and smooth appearance of the hilly and mountain tractor. The engine and its accessories 3 provide the power required for the folding and waist-twisting tractor. The roll-over protection frame assembly 9 and the seat assembly 24 can provide a safe and comfortable operating environment for the driver. The electrical system assembly 23 provides the electricity required for lighting, steering and starting the engine of the tractor. The front frame assembly 2 plays a role in supporting the front hood assembly 1, and the front drive wheels 4 and the rear drive wheel assembly 6 can realize the walking function of the tractor.

[0036] Such as Figure 4 、 6As shown in the figure, the function of the vehicle's waist-folding steering is mainly realized by the combination of the steering system assembly 10 and the front box and waist-folding and torsion assembly 5. The front box and waist-folding and torsion assembly 5 includes a front box 5.1, a waist-folding housing 5.2, a waist-folding pin shaft 5.3, a torsion housing 5.4, a torsion inner housing 5.5, a reversing housing 5.6, a first bolt 5.7, a bushing 5.8, a snap ring 5.9, a second bolt 5.10, and a third bolt 5.11. The waist-folding housing 5.2 is fixed to the rear of the front box 5.1 by the third bolt 5.11. The torsion housing 5.4 is connected to the waist-folding housing 5.2 by the waist-folding pin shaft 5.3. The waist-folding pin shaft 5.3 is fixed to the torsion housing 5.4 by the second bolt 5.10. The bushing 5.8 is installed between the torsion housing 5.4 and the torsion inner housing 5.5. The torsion housing 5.4 is installed outside the torsion inner housing 5.5. The front end of the torsion inner housing 5.5 is limited by the snap ring 5.9 between the inner wall of the torsion housing 5.4. The torsion inner housing 5.5 is fixed to the reversing housing 5.6 by the first bolt 5.7. The snap ring protective cover 5.12 is fixed to the torsion inner housing 5.5 by the fourth bolt 5.13. The torsion inner housing 5.5 is fixed to the reversing housing 5.6 by the first bolt 5.7. The reversing housing 5.6 is connected to the rear box assembly 20 by the bolt Z. The steering system assembly 10 of the waist-folding steering tractor mainly includes: a steering gear inlet pipe 10.5, a steering wheel 10.1, a steering gear 10.2, a double-acting steering cylinder 10.3, a steering return pipe 10.6, a steering cylinder inlet pipe 10.7, a front welding bracket 10.4, and a rear welding bracket 10.9. The front end of the steering gear inlet pipe 10.5 is connected to the priority valve 15.5 by a hollow bolt and the rear end is connected to the steering gear 10.2 by the fifth bolt. The front welding bracket 10.4 is fixed to the front box 5.1 by the sixth bolt. The rear welding bracket 10.9 is connected to the upper part of the torsion housing 5.4 by the seventh bolt. The steering wheel 10.1 and the steering gear 10.2 are fixed to the rear instrument panel assembly 22 by the eighth bolt. One end of the double-acting steering cylinder 10.3 is connected to the front welding bracket 10.4 by the ninth bolt and the other end is connected to the rear welding bracket 10.9 by the tenth bolt. One end of the steering cylinder inlet pipe 10.7 is connected to the double-acting steering cylinder 10.3 and the other end is connected to the steering gear 10.2. One end of the steering return pipe 10.6 is connected to the steering gear 10.2 and the other end is connected to the upper part of the front box 5.1.

[0037] The specific implementation process of the waist-hinged steering is as follows. When the tractor steers, its double-acting steering cylinder 10.3 extends and compresses, and then the front box 5.1 rotates clockwise or counterclockwise around the waist-hinged pin shaft 5.3 to realize the waist-hinged steering function of the whole machine, so as to achieve the left and right steering of the whole vehicle; when a single front wheel falls into a pit, the front box 5.1, the waist-hinged housing 5.2, and the torsion housing 5.4 rotate clockwise or counterclockwise around the torsion inner housing 5.5, thus realizing the torsion function of the whole vehicle. The bushing 5.8 in the torsion housing 5.4 and the torsion inner housing 5.5 can play a role in reducing wear. There is a limit function between the torsion housing 5.4 and the reversing housing 5.6 to realize the ±15° torsion limit of the whole vehicle. The circlip 5.9 can prevent the torsion housing 5.4 from disengaging from the torsion inner housing 5.5 in the traction state. The circlip protective cover 5.12 is fixed on the torsion inner housing 5.5 by the fourth bolt 5.13 to prevent the circlip 5.9 from coming out.

[0038] The specific implementation process of the extension and compression of the double-acting steering cylinder 10.3 is as follows. High-pressure oil enters the steering gear 10.2 through the steering gear inlet pipe 10.5, and the steering is controlled by the steering wheel 10.1. The high-pressure oil enters the double-acting steering cylinder 10.3 through the steering cylinder inlet pipe 10.7 to realize the extension and compression of the double-acting steering cylinder 10.3; the return oil of the steering returns to the front box 5.1 through the steering return pipe 10.6.

[0039] As Figure 5As shown in the figure, the hydraulic lifting pipeline system assembly 15 mainly includes: gear pump 15.1, suction pipe 15.3, high-pressure hard pipe 15.2, oil suction filter 15.4, priority valve 15.5, valve block return pipe 15.6, high-pressure hose 15.9, hydraulic output valve block 15.10, lifting control handle 15.7, hydraulic output control handle 15.12, lifting cylinder oil pipe 15.8, and hydraulic output joint 15.11. The gear pump 15.1 is fixed on the engine and its accessories 3 by the eleventh bolt. The front end of the suction pipe 15.3 is connected to the lifting gear pump 15.1 by the twelfth bolt, and the rear end of the suction pipe 15.3 is connected to the oil suction filter 15.3 by the thirteenth bolt. The oil suction filter 15.4 is fixed on the engine and its accessories 3 by the fourteenth bolt. The front end of the oil suction filter 15.4 is connected to the suction pipe 15.3, and the rear end is connected to the front box 5.1. The front end of the high-pressure hard pipe 15.2 is connected to the gear pump 15.1 by the fifteenth bolt, and the rear end of the high-pressure hard pipe 15.2 is connected to the priority valve 15.5 by the sixteenth bolt. The priority valve 15.5 is fixed on the engine and its accessories 3 by the seventeenth bolt. The front end of the high-pressure hose 15.9 is connected to the priority valve 15.5, and the rear end of the high-pressure hose 15.9 is connected to the hydraulic output valve block 15.10. The hydraulic output valve block 15.10 is fixed to the rear right end 19.4 by the eighteenth bolt. The lifting control handle 15.7 is fixed on the hydraulic output valve block 15.10 by the nineteenth bolt. The hydraulic output control handle 15.12 is fixed on the hydraulic output valve block 15.10 by the twentieth bolt. The front end of the lifting cylinder oil pipe 15.8 is connected to the hydraulic output valve block 15.10, and the rear end of the lifting cylinder oil pipe 15.8 is connected to the lifting cylinder 21.2. The hydraulic output joint 15.11 is connected to the hydraulic output valve block 15.10; one end of the valve block return pipe 15.6 is connected to the hydraulic output valve block 15.10, and the other end is connected to the front box 5.1.

[0040] The specific implementation process of hydraulic lifting is as follows. The lifting gear pump 15.1 sucks oil from the front box 5.1 through the suction pipe 15.3 and the oil suction filter 15.4. The high-pressure oil reaches the priority valve 15.5 through the high-pressure pipe 15.2. The priority valve 15.5 distributes a part of the high-pressure oil to the steering gear inlet pipe 10.5 in the steering system 10 to achieve steering, and the other part of the high-pressure oil reaches the hydraulic output valve block 15.10 through the high-pressure hose 15.9. By operating the lifting control handle 15.7, the high-pressure oil flows through the lifting cylinder oil pipe 15.8 to the lifting cylinder 21.2, realizing the lifting and lowering of the suspension assembly 13, and thus realizing the lifting and lowering functions of the agricultural implements. By operating the hydraulic output control handle 15.12, the high-pressure oil flows through the hydraulic output joint 15.11 to the implement, realizing the output function of the high-pressure oil. The excess high-pressure oil flows back to the front box 5.1 through the valve block return pipe 15.6.

[0041] The medium and small power articulated steering tractor provided by the present utility model is developed according to the development prospect and demand trend of the domestic market. The core technologies include the overall machine layout structure, the articulated and torsion structure, the snap ring anti-disengagement structure, the steering drive structure of a double-acting single oil cylinder, and the hydraulic system structure. The present utility model can meet the increasing operation requirements of the market for medium and small power tractors. It has high operation comfort, maneuverability, and safety reliability, and can bring considerable economic profits and good social benefits to the enterprise.

[0042] The overall machine layout characteristics of the medium and small power articulated steering tractor provided by the present utility model are: articulated steering, front-mounted engine, and equal-sized four wheels. Compared with traditional tractors, the center of mass is forward, which can avoid the phenomenon of the whole machine tipping up during transportation in hilly and mountainous areas; it can greatly reduce the turning circle radius and improve the maneuverability of the whole machine; compared with traditional medium and small power tractors, the operation efficiency is increased by about 30%.

[0043] The parts not detailed in the present utility model are the prior art.

Claims

1. A small to medium power bending steering tractor, comprising a chassis, a front frame assembly (2), a front drive wheel (4), a rear drive wheel (6), a steering system assembly (10), a suspension assembly (13) and a hydraulic lifting pipeline system assembly (15), wherein: The chassis comprises an end assembly and an engine and its accessory assembly (3), a front box and a folding and twisting assembly (5), and a rear box assembly (20) which are connected in sequence from front to rear. The end assembly comprises a front left end (19.1), a front right end (19.2), a rear left end (19.3), and a rear right end (19.4). The front left end (19.1) and the front right end (19.2) are respectively connected to the left and right sides of the front box and the folding and twisting assembly (5), and the rear left end (19.3) and the rear right end (19.4) are respectively connected to the two sides of the rear box assembly (20). The front drive wheel (4) comprises a front left drive wheel (4.1) and a front right drive wheel (4.2). The front left drive wheel (4.1) is connected to the front left end (19.1), and the front right drive wheel (4.2) is connected to the front right end (19.2). The rear drive wheel (6) comprises a rear left driving wheel (6.1) and a rear right driving wheel (6.2), wherein the rear left driving wheel (6.1) is connected to the rear left end (19.3), and the rear right driving wheel (6.2) is connected to the rear right end (19.4); the front frame assembly (2) is fixedly connected to the front of the engine and its accessory assembly (3); the upper part of the front box and the waist bending and twisting assembly (5) is connected to the oil tank assembly (11), the rear end of the rear box assembly (20) is connected to the lifting assembly (21), and the upper part of the rear box assembly (20) is connected to the seat assembly (24); the hydraulic lifting pipeline system assembly (15) is respectively connected to the front box and the waist bending and twisting assembly (5), the engine and its accessory assembly (3), the steering system assembly (10), the end assembly and the lifting assembly (21), and the steering system assembly (10) is also connected to the front box and the waist bending and twisting assembly (5).

2. A small to medium power bending steering tractor according to claim 1, characterized in that: The front box and waist-bending and waist-twisting assembly (5) comprises a front box (5.1), a waist-bending shell (5.2), a waist-bending pin (5.3), a waist-twisting outer shell (5.4), a waist-twisting inner shell (5.5), a reversing shell (5.6), a first bolt (5.7), a bushing (5.8), a retaining spring (5.9), a second bolt (5.10), a third bolt (5.11), a retaining spring protective cover (5.12) and a fourth bolt (5.13); the waist-bending shell (5.2) is fixed to the rear of the front box (5.1) by the third bolt (5.11); the waist-twisting outer shell (5.4) is connected to the waist-bending shell (5.2) by the waist-bending pin (5.3); the waist-bending pin (5.3) is fixed to the waist-twisting outer shell (5.4) by the second bolt (5.10); the bushing (5.8) is installed between the waist-twisting outer shell (5.4) and the waist-twisting inner shell (5.5); The waist outer shell (5.4) is mounted on the outside of the waist twisting inner shell (5.5); the front end of the waist twisting inner shell (5.5) and the inner wall of the waist twisting outer shell (5.4) are limited by a retaining spring (5.9); the retaining spring protective cover (5.12) is fixed to the waist twisting inner shell (5.5) by a fourth bolt (5.13); the waist twisting inner shell (5.5) is fixed to the reversing shell (5.6) by a first bolt (5.7); the reversing shell (5.6) is connected to the rear box assembly (20) by bolts; the engine and its accessories assembly (3) is connected to the front box (5.1); the hydraulic lifting pipeline system assembly (15) is respectively connected to the front box (5.1), the engine and its accessories assembly (3), the steering system assembly (10), the rear right end (19.4) and the lifter assembly (21); the steering system assembly (10) is respectively connected to the front box (5.1) and the waist twisting outer shell (5.4).

3. A small to medium power bending steering tractor according to claim 2, characterized in that: The hydraulic lifting pipeline system assembly (15) includes a gear pump (15.1), an oil suction pipe (15.3), a high-pressure hard pipe (15.2), an oil suction filter (15.4), a priority valve (15.5), a valve block oil return pipe (15.6), a high-pressure hose (15.9), a hydraulic output valve block (15.10), a lifting control handle (15.7), a hydraulic output control handle (15.12), a lifting cylinder oil pipe (15.8), and a hydraulic output joint (15.11); the gear pump (15.1) is fixed to the engine The front end of the oil suction pipe (15.3) is connected to the lifting gear pump (15.1), the rear end of the oil suction pipe (15.3) is connected to the oil suction filter 15.3, the oil suction filter (15.4) is fixed to the engine and its accessory assembly (3), the front end of the oil suction filter (15.4) is connected to the oil suction pipe (15.3), and the rear end is connected to the front box (5.1), the front end of the high-pressure hard pipe (15.2) is connected to the gear pump (15.1), and the rear end of the high-pressure hard pipe (15.2) is connected to the priority valve (15.5), the priority valve (15.5) is fixed on the engine and its accessory assembly (3), the front end of the high-pressure hose (15.9) is connected to the priority valve (15.5), the rear end of the high-pressure hose (15.9) is connected to the hydraulic output valve block (15.10), the hydraulic output valve block (15.10) is fixedly connected to the rear right end (19.4), the lifting control handle (15.7) is fixed on the hydraulic output valve block 15.10, the hydraulic output control handle (15.12) is fixed on the hydraulic output valve block (15.10), and the lifting cylinder oil pipe (15.8) One end is connected to the hydraulic output valve block (15.10), and the other end of the lifting cylinder oil pipe (15.8) is connected to the lifter assembly (21); the hydraulic output connector (15.11) is connected to the hydraulic output valve block (15.10); one end of the valve block oil return pipe (15.6) is connected to the hydraulic output valve block (15.10), and the other end is connected to the front box (5.1); the steering system assembly (10) has a steering gear oil inlet pipe (10.5), and the priority valve (15.5) is connected to the front end of the steering gear oil inlet pipe (10.5) through a hollow bolt.

4. A small to medium power bending steering tractor according to claim 3, characterized in that: The lifter assembly (21) comprises a reminder bracket (21.1) and a lift cylinder (21.2), and the rear end of the lift cylinder oil pipe (15.8) is connected to the lift cylinder (21.2).

5. A small to medium power bending steering tractor according to claim 2, characterized in that: The twist waist outer shell (5.4) is connected to a rear instrument cover assembly (22), and the rear instrument cover assembly (22) is connected to an electrical system assembly (23); the steering system assembly (10) comprises a steering wheel (10.1), a steering gear (10.2), a double-acting steering oil cylinder (10.3), a steering gear oil inlet pipe (10.5), a steering oil return pipe (10.6), a steering cylinder oil inlet pipe (10.7), a front welding bracket (10.4) and a rear welding bracket (10.9); the front end of the steering gear oil inlet pipe (10.5) is connected to the hydraulic lifting pipeline system assembly (15), and the rear end is connected to the steering gear (10.2) by bolts; the front welding bracket (10.4) is connected to the hydraulic lifting pipeline system assembly (15) by bolts. The front box (5.1) is fixed with bolts, and the rear welding bracket (10.9) is connected with the upper part of the twist waist outer shell (5.4) with bolts; the steering wheel (10.1) and the steering gear (10.2) are fixed with the rear instrument cover assembly (22); one end of the double-acting steering cylinder (10.3) is connected with the front welding bracket (10.4), and the other end is connected with the rear welding bracket (10.9); one end of the steering cylinder oil inlet pipe (10.7) is connected with the double-acting steering cylinder (10.3), and the other end is connected with the steering gear (10.2); one end of the steering oil return pipe (10.6) is connected with the steering gear (10.2), and the other end is connected with the upper part of the front box (5.1).

6. A small to medium power bending steering tractor according to claim 1, characterized in that: The suspension assembly (13) is respectively connected to the rear left end (19.3), the rear right end (19.4) and the lifter assembly (21).

7. A small to medium power bending steering tractor according to claim 1, characterized in that: The seat assembly (24) is connected to the rear box assembly (20) via a base assembly (16); the base assembly (16) is connected to the upper part and the left and right sides of the rear box assembly (20); the lower part of the seat assembly (24) is connected to the upper part of the base assembly (16); the base assembly (16) is connected to a rear fender assembly (7); the rear fender assembly (7) comprises a left rear fender (7.1) and a right rear fender (7.2); the lower part of the left rear fender (7.1) is connected to the rear left end (19.3), and the upper part is connected to the left side of the bottom of the base assembly (16); the lower part of the right rear fender (7.2) is connected to the rear right end (19.4), and the upper part is connected to the right side of the bottom of the base assembly (16).

8. A small to medium power bending steering tractor according to claim 1, characterized in that: The front left end (19.1) and the front right end (19.2) are commonly connected to a front anti-rollover frame (9.2), and the front left mudguard (12.1) and the front right mudguard (12.2) are respectively connected to the left and right sides of the front anti-rollover frame (9.2); the upper part of the lifter assembly (21) is connected to a rear anti-rollover frame (9.1).

9. A small to medium power bending steering tractor according to claim 1, characterized in that: The front frame assembly (2) is connected to a front hood assembly (1); a front end of the front hood assembly (1) is connected to the front frame assembly (2) via a pin shaft, and a rear end is overlapped with a front portion of the fuel tank assembly (11).

10. A small to medium power bending steering tractor according to claim 1, characterized in that: It also includes an air brake device (8), a trailer assembly (14), a brake assembly (17) and a clutch assembly (18).

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