CN113733904A

CN113733904A - Tractor

Info

Publication number: CN113733904A
Application number: CN202111074138.2A
Authority: CN
Inventors: 王永亮; 方增强; 侯培龙
Original assignee: Henan Zoomlion Intelligent Agricultural Machinery Co ltd
Current assignee: Henan Zoomlion Intelligent Agricultural Machinery Co ltd
Priority date: 2021-09-14
Filing date: 2021-09-14
Publication date: 2021-12-03

Abstract

The invention relates to a tractor, which comprises a front counterweight assembly, a front driving wheel assembly, a power assembly, a hydraulic system assembly, a clutch assembly, a steering system assembly, a gearbox assembly, a control feedback system assembly, an electrical system assembly, a power output assembly, a lifting suspension system assembly, a front driving axle assembly, a rear driving wheel assembly and a braking system assembly, wherein the front counterweight assembly is arranged on the front side of the front driving axle assembly; and the control device of the hydraulic system assembly controls the clutch assembly, the power output assembly and the lifting suspension system assembly in a linkage mode through the control feedback system assembly. The invention realizes linkage control of the lifting suspension assembly and the power output assembly, realizes combined mediation of lifting and power output, meets the requirement of realizing power on-off when different machines and tools are hung and need different lifting heights, and has the advantages of simple structure, convenient mediation and low manufacturing cost.

Description

Tractor

Technical Field

The invention relates to the technical field of agricultural machinery, in particular to a tractor.

Background

In the matching operation and use process of the traditional tractor and farm tools, a lifting suspension system and a power output system of the traditional tractor respectively need to be operated by a driver independently. If a tractor is used for lifting the implement, the lifting operation handle needs to be independently operated, and if power output operation is needed, the power output operation device needs to be independently operated. In actual operation, a driver needs to repeatedly operate lifting and power output clutch operation for many times, and frequently and independently operate the connection and disconnection of the lifting and the power output, so that the labor intensity of the driver is increased. When the unit operation arrives the head of a ground, the driver still needs to operate the lifting control handle simultaneously and lift the machines, if the power of the power output shaft is not cut off in the lifting process, or the lifting height is too high, the angle that can lead to the power output transmission shaft is too big, and then the damage that leads to tractor power output, universal joint or machines. Therefore, a tractor capable of realizing linkage control of lifting action and power output is needed to be developed, so that the labor intensity of a driver is reduced, a unit is better protected, and faults are reduced.

Disclosure of Invention

The invention aims to solve the technical problem of providing a tractor capable of realizing linkage control of lifting action and power output aiming at the defects.

The invention is realized by the following technical scheme:

a tractor comprises a front counterweight assembly, a front driving wheel assembly, a power assembly, a hydraulic system assembly, a clutch assembly, a steering system assembly, a gearbox assembly, a control feedback system assembly, an electrical system assembly, a power output assembly, a lifting suspension system assembly, a front driving axle assembly, a rear driving wheel assembly and a braking system assembly; the front counterweight assembly is connected to a bracket of the front driving wheel assembly, and the front driving wheel assembly is connected to the front driving axle assembly; the engine assembly of the power assembly is respectively connected with the hydraulic system assembly, the gearbox assembly and the power output assembly, the clutch assembly is connected with and controls the power output of the gearbox assembly and the power output assembly, the hydraulic system assembly is connected with the lifting suspension system assembly, and the electrical system assembly is connected with the engine assembly; the steering system assembly is connected with the front drive axle assembly, and the braking system assembly is connected with the rear drive wheel assembly; and the control device of the hydraulic system assembly controls the clutch assembly, the power output assembly and the lifting suspension system assembly in a linkage mode through the control feedback system assembly.

Furthermore, the tractor further comprises a hood assembly, a floor assembly and a fuel tank assembly; the fuel tank assembly is located on the front half portion of the tractor, the hood assembly is fixed on the periphery of the engine assembly, and the floor assembly is installed above the gearbox assembly.

Further, the tractor, the power assembly includes a cooling system assembly, the engine assembly, an exhaust system assembly and an air intake system assembly; the cooling system assembly, the exhaust system assembly and the air intake system assembly are respectively connected with the engine assembly.

Furthermore, the hydraulic system assembly of the tractor comprises a control device, a multi-way valve, a height limit feedback rod, a lifter, a lifting oil cylinder and the hydraulic pump; the operating device is connected with a lifter of the lifting suspension system assembly through the height limiting feedback rod, and the operating device is connected with and controls the flow direction of hydraulic oil of the multi-way valve through a flexible shaft; the engine assembly is connected with the hydraulic pump, and the hydraulic pump is connected with the lifting oil cylinder through the multi-way valve.

Further, the hydraulic system assembly of the tractor further comprises a hydraulic output joint and an oil filter; the multi-way valve provides a plurality of oil outlets, one of the oil outlets is connected with the hydraulic output joint, and the hydraulic pump is connected with the multi-way valve through the oil filter.

Further, the tractor is characterized in that the clutch assembly comprises a double-acting clutch, a main clutch operation and an auxiliary clutch operation; the main clutch operation controls the power input of the gearbox assembly, and the auxiliary clutch operation controls the power input of the power output assembly; the secondary clutch operates a lifter connected to the lift suspension assembly.

Further, the tractor, the steering system assembly includes a steering gear, a steering oil can and a steering pump; the engine assembly is connected with the steering pump, the steering pump is connected with the steering gear through the steering oil can, and the steering gear is connected with the front drive axle assembly.

Further, in the tractor, the gearbox assembly is connected with the rear driving wheel assembly and the power output assembly, or/and the gearbox assembly is connected with the front driving axle assembly.

Further, the power output assembly of the tractor comprises a power output shaft, a speed change gear assembly and a speed change operation; the speed change operation controls the rotating speed of the power output shaft through the speed change gear assembly; when the speed change operation is positioned at the lower position, the power output shaft is at a low speed, when the speed change operation is positioned at the middle position, the power output shaft is at a neutral gear and does not rotate, and when the speed change operation is positioned at the upper position, the power output shaft is at a high speed.

Further, the tractor, the braking system assembly includes brake pedal, link and brake; the brake pedal is connected and controls the brake through the connecting rod, and the brake is connected with the rear driving wheel assembly.

The invention has the advantages and effects that:

the tractor operating device provided by the invention realizes linkage control of the lifting suspension assembly and the power output assembly and joint mediation of lifting and power output by controlling the feedback system assembly to control the clutch assembly, the power output assembly and the lifting suspension system assembly in a linkage manner, meets the requirement of realizing power on-off when different machines and tools are hooked and need different lifting heights, and has the advantages of simple structure, convenience in mediation and low manufacturing cost.

Drawings

FIG. 1 shows a schematic structural view of a tractor provided by the present invention;

FIG. 2 shows a top view of FIG. 1;

FIG. 3 shows a schematic structural view of a power train of a tractor provided by the present invention;

FIG. 4 is a schematic diagram of a tractor hydraulic system assembly according to the present invention;

FIG. 5 is a schematic structural view of a steering feedback system assembly of the tractor provided by the present invention;

FIG. 6 is a schematic structural view of a steering system assembly of the tractor provided by the present invention;

FIG. 7 is a schematic diagram illustrating the construction of the electrical system assembly of the tractor according to the present invention;

FIG. 8 is a schematic illustration of the power take off assembly of the tractor according to the present invention;

FIG. 9 is a schematic structural view of a lift suspension assembly of the tractor according to the present invention;

FIG. 10 is a schematic structural view of a brake system assembly of a tractor according to the present invention;

fig. 11 shows a schematic diagram of the hydraulic system and functions of the tractor provided by the present invention.

Description of reference numerals: the engine comprises a front counterweight assembly (1), a front driving wheel assembly (2), a hood assembly (3), a power assembly (4), a cooling system assembly (4.1), an engine assembly (4.2), an exhaust system assembly (4.3), an air inlet system assembly (4.4), a hydraulic system assembly (5), an operating device (5.1), a multi-way valve (5.2), a height limit feedback rod (5.3), a hydraulic output joint (5.4), a clutch operating device (5.5), a lifting oil cylinder (5.6), an oil filter (5.7), a hydraulic pump (5.8), a clutch assembly (6), a double-acting clutch (6.1), a main clutch operation (6.2), an auxiliary clutch operation (6.3), a steering system assembly (7), a steering gear (7.1), a steering oil pot (7.2), a steering pump (7.3), a gearbox assembly (8), a floor assembly (9), an operation feedback system assembly (10), an electric appliance system assembly (11), The automobile headlamp comprises a storage battery (11.1), a headlamp assembly (11.2), an ECU (11.3), a control element (11.4), a rear headlamp assembly (11.5), a power output assembly (12), a power output shaft (12.1), a speed change gear assembly (12.2), a speed change control (12.3), a lifting suspension system assembly (13), a lifter (13.1), an upper pull rod (13.2), a lifting rod (13.3), a lower pull rod (13.4), a lower pull rod support (13.5), a limiting rod (13.6), a limiting rod support (13.7), a front drive axle assembly (14), a fuel tank assembly (15), a rear drive wheel assembly (16), a brake system assembly (17), a movable pedal (17.1), a connecting rod (17.2) and a brake (17.3).

Detailed Description

In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention are described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Embodiments of the present invention are described in detail below with reference to the accompanying drawings:

in the description of the present invention, it is to be understood that, unless otherwise specified, "a plurality" means two or more; the terms "central," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated in a particular orientation, and are therefore not to be construed as limiting the scope of the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.

Double-acting clutch: a clutch separating the engine from the gearbox and the power take-off may be combined separately.

The feedback control mechanism comprises: the automatic feedback and automatic operation of the machine set are realized.

A feedback connecting rod: are often used for force transmission and support.

Flexible shaft: a shaft with low rigidity and elastic free bending transmission is used for connecting two shafts with different axes not in the same direction or with relative movement to transmit rotary motion and torque.

Fig. 1 and 2 show schematic structural diagrams of a tractor provided by the invention. The tractor comprises a front counterweight assembly 1, a front driving wheel assembly 2, a hood assembly 3, a power assembly 4, a hydraulic system assembly 5, a clutch assembly 6, a steering system assembly 7, a gearbox assembly 8, a floor assembly 9, an operation feedback system assembly 10, an electrical system assembly 11, a power output assembly 12, a lifting suspension system assembly 13, a front driving axle assembly 14, a fuel tank assembly 15, a rear driving wheel assembly 16 and a braking system assembly 17. The front counterweight assembly 1 is connected to the front end of a bracket of the front driving wheel assembly 2 (the direction of the tractor head is front) and is used for applying weight to the front end of the tractor, so that the phenomenon that the front end of the tractor tilts up when the rear lifting suspension system assembly 13 of the tractor is hung on farm tools in a heavier mode is avoided, a certain grounding force of the front driving wheel can be guaranteed, and the steering performance of the tractor can be met. The front driving wheel assembly 2 is connected with a front driving axle assembly 14, fixed in front of the engine assembly 4.2 and used for supporting the front end of the tractor and realizing the steering function of the tractor. The hood assembly 3 is fixed on the periphery of the engine assembly 4.2, is used for protecting the cooling system assembly 4.1 and the engine assembly 4.2 of the power assembly 4, and is used for installing a headlamp assembly 11.2 of the electrical system assembly 11. An engine assembly 4.2 of the power assembly 4 is respectively connected with the hydraulic system assembly 5, the gearbox assembly 8 and the power output assembly 12 to supply power for the power assembly. The clutch assembly 6 is connected with and controls the power output of the gearbox assembly 8 and the power output assembly 12 and is used for transmitting and cutting off the power transmission of the engine assembly 4.2 to the gearbox assembly 8 and the power output assembly 12. The hydraulic system assembly 5 is connected with a lifting suspension system assembly 13 for realizing the lifting action of the tractor and providing a hydraulic output interface. The electrical system assembly 11 is connected with the engine assembly 4.2 to provide power to start the engine assembly motor. The steering system assembly 7 is connected with a front drive axle assembly 14 to realize the steering of the tractor. A brake system assembly 17 is connected to the rear drive wheel assembly 16 to effect braking of the tractor. The control device 5.1 of the hydraulic system assembly 5 controls the clutch assembly 6, the power output assembly 12 and the lifting suspension system assembly 13 in a linkage manner through the control feedback system assembly 10, so that linkage control of lifting height and power output is realized. The fuel tank assembly 15 is located at the lower front half of the tractor, and is safe and convenient for refueling. A floor assembly 9 is mounted above the transmission assembly 8 to provide a seating space and an operating platform for the driver.

Fig. 3 shows a schematic structural diagram of a power assembly of the tractor provided by the invention. The power assembly 4 mainly provides power for the tractor, and comprises a cooling system assembly 4.1, an engine assembly 4.2, an exhaust system assembly 4.3 and an air intake system assembly 4.4. The cooling system assembly 4.1, the exhaust system assembly 4.3 and the air intake system assembly 4.4 are respectively connected with the engine assembly 4.2. The cooling system assembly 4.1 is used to maintain the thermal balance of the engine assembly 4.2, the exhaust system assembly 4.3 is used to treat the exhaust gases and noise of the engine assembly 4.2, and the intake system assembly 4.4 is used to filter the air entering the engine assembly 4.2.

Fig. 4 shows a schematic structural diagram of a hydraulic system assembly of the tractor provided by the invention. The hydraulic system assembly 5 is used for realizing the lifting action of the tractor and providing a hydraulic output interface and comprises a control device 5.1, a multi-way valve 5.2, a height limit feedback rod 5.3, a hydraulic output joint 5.4, a clutch control device 5.5, a lifting oil cylinder 5.6, an oil filter 5.7 and a hydraulic pump 5.8. The engine assembly 4.2 is connected with the hydraulic pump 5.8 to supply power to the hydraulic system assembly 5, and the hydraulic pump 5.8 is connected with the lifting oil cylinder 5.6 through the multi-way valve 5.2. Specifically, hydraulic pump 5.8 is connected with the oil inlet of multiple unit valve 5.2 through an oil pipe, and multiple unit valve 5.2 provides a plurality of oil-outs, and wherein 1 oil-out is connected the oil inlet of lift cylinder 5.6, provides hydraulic energy for hydraulic system assembly 5, and the oil-out of lift cylinder 5.6 passes through back oil pipe and connects multiple unit valve 5.2, and fluid returns the oil tank through returning oil pipe again and forms fluid circulation circuit, and remaining 1 to 3 oil-outs connect hydraulic output joint 5.4 and provide hydraulic output for the agricultural implement. The operating device 5.1 is connected with a valve rod of the multi-way valve 5.2 through a flexible shaft to control a valve core of the multi-way valve 5.2, and then the operating device 5.1 is pulled to control the flow direction of hydraulic oil to control the action of the lifting oil cylinder 5.6, so that the lifting, descending, forced pressure and floating functions of the tractor lifting system are realized. The operating device 5.1 is connected with a lifting oil cylinder 5.6 through a height limit feedback rod 5.3, and the height limit feedback rod 5.3 is used for setting the lifting height. Specifically, a positioning bolt which can slide and is fixed is arranged on the height limiting feedback rod 5.3, one end of the height limiting feedback rod 5.3 is connected with the operating device 5.1, the other end of the height limiting feedback rod passes through a connecting hole on one side of a lifter 13.1 of the lifting suspension system assembly 13 and is limited by the positioning bolt, when the lifting oil cylinder 5.6 is lifted to the limit of the positioning bolt, the height limiting feedback rod 5.3 stops the lifting action controlled by the operating device 5.1, and then the multi-way valve 5.2 is controlled to cut off the supply of hydraulic oil to the lifting oil cylinder 5.6. The other side of the lifter 13.1 is provided with a clutch operating device 5.5. The hydraulic pump 5.8 is connected with the multi-way valve 5.2 through an oil filter 5.7, and impurities in the hydraulic system assembly 5 are filtered to protect hydraulic elements.

Fig. 5 is a schematic structural diagram of a steering feedback system assembly of a tractor according to the present invention. The operation feedback system assembly 10 realizes linkage among the operation device 5.1, the clutch assembly 6, the power output assembly 12 and the lifting suspension system assembly 13. The clutch assembly 6 is used for transmitting and cutting off the power transmission of the engine assembly 4.2 to the gearbox assembly 8 and the power output assembly 12, and comprises a double-acting clutch 6.1, a main clutch operation 6.2 and an auxiliary clutch operation 6.3. The main clutch operation 6.2 controls the power input of the gearbox assembly 8, and the auxiliary clutch operation 6.3 controls the power input of the power output assembly 12. Specifically, the height limit feedback rod 5.3 is connected with one side of a lifting arm of a lifter 13.1 of the lifting suspension system assembly 13, the auxiliary clutch operating device 5.5 is connected with the clutch operating device 5.5 on the other side through a flexible shaft, and the action of the lifting arm is linked with the height limit feedback rod 5.3 and the auxiliary clutch operating device 5.5 to realize the engagement and the disengagement of the power input of the lifting action control power output assembly 12. And the operating device 5.1 is pulled, when the lifting height is set, the height limit feedback rod 5.3 connected to one side of the lifting arm feeds back to stop the action, and meanwhile, the auxiliary clutch operating device 6.3 connected to the other side of the lifting arm disconnects the power of the clutch, so that the power input of the power output assembly 12 is disconnected, and the linkage control of the lifting height and the power output is realized.

Fig. 6 is a schematic structural view of a steering system assembly of a tractor according to the present invention. The steering system assembly 7 comprises a steering gear 7.1, a steering oil can 7.2 and a steering pump 7.3. The engine assembly 4.2 is connected with a steering pump 7.3 to supply power to the steering system assembly 7. The steering pump 7.3 is connected with the steering gear 7.1 through the steering oil can 7.2, the steering gear 7.1 is connected with the front drive axle assembly 14, and the steering oil cylinder on the front drive axle assembly 14 is controlled by the driver to operate the steering gear 7.1 to realize the steering of the tractor.

The transmission assembly 8 transmits power from the engine assembly 4.2, the transmission assembly 8 is connected with the rear driving wheel assembly 16 and the power output assembly 12, and the power is transmitted to the rear driving wheel assembly 16 and the power output assembly 12 through gear change. Meanwhile, the gearbox assembly 8 can also be connected with a front drive axle assembly 14, and power is transmitted to the front drive axle assembly 14 through a transfer case to drive the front drive wheel assembly 2, so that four-wheel drive is realized.

Fig. 7 is a schematic structural diagram of an electrical system assembly of the tractor according to the present invention. The electrical system assembly 11 comprises a battery 11.1, a headlight assembly 11.2, an electronic control unit 11.3, a control element 11.4 and a backlight assembly 11.5. The storage battery 11.1 is connected with the engine assembly 4.2, the headlamp assembly 11.2, the electronic controller unit 11.3, the control element 11.4 and the backlight assembly 11.5, and provides power for the tractor to start the engine assembly motor.

Fig. 8 shows a schematic view of the power take-off assembly of the tractor according to the invention. The power output assembly 12 comprises a power output shaft 12.1, a speed change gear assembly 12.2 and a speed change operation 12.3, wherein the speed change operation 12.3 controls the rotating speed of the power output shaft 12.1 through the speed change gear assembly 12.2. When the speed change operation 12.3 is in the lower position, the power output shaft 12.1 is in the low speed, when the speed change operation 12.3 is in the middle position, the power output shaft 12.1 is in the neutral position and does not rotate, and when the speed change operation 12.3 is in the upper position, the power output shaft 12.1 is in the high speed, and double-speed power output can be realized.

Fig. 9 is a schematic structural view of a lift suspension assembly of a tractor according to the present invention. The lifting suspension system assembly 13 comprises a lifter 13.1, an upper pull rod 13.2, a lifting rod 13.3, a lower pull rod 13.4, a lower pull rod support 13.5, a limiting rod 13.6 and a limiting rod support 13.7, and is used for connecting the tractor and the machine tool.

Fig. 10 is a schematic structural diagram of a brake system assembly of a tractor according to the present invention. The brake system assembly 17 comprises a brake pedal 17.1, a connecting rod 17.2 and a brake 17.3. The brake pedal 17.1 is connected with a control brake 17.3 through a connecting rod 17.2, and the brake 17.3 is connected with the rear driving wheel assembly 16 to realize the braking of the tractor.

When the auxiliary clutch operation 6.3 is in the pull-up position, the speed change operation 12.3 of the power output assembly 12 is in any position, the power output shaft 12.1 has no power output, the clutch operation device 5.5 does not act on the double-acting clutch 6.1, the double-acting clutch 6.1 has no power transmission to the power output shaft 12.1, and the operation device 5.1 can lift and lower the machine tool under the condition of no power output.

When the auxiliary clutch operation 6.3 is in the down position and the speed change operation 12.3 of the power output assembly 12 is in the neutral position, the power output shaft 12.1 has no power output, the clutch operation device 5.5 acts on the double-acting clutch 6.1, but the power output shaft 12.1 still has no power transmission because the gears are not meshed, and the operation device 5.1 can lift and lower the machine tool under the condition of no power output.

When the auxiliary clutch operation 6.3 is in the down position and the speed change operation 12.3 of the power output assembly 12 is in the up/down position, the power output shaft 12.1 is in power connection with high/low speed, and then the lifting action and the power output start to work in a linkage way: when the operating device 5.1 is positioned at the lower position, the machine tool is positioned at the descending (operation) position, and the double-acting clutch 6.1 is engaged to transmit power to the power output shaft 12.1 to drive the machine tool to normally operate; when a driver operates the operating device 5.1 to be positioned at an upper position, the lifter 13.1 starts to lift the farm tool, when the lifting height reaches the height set by the height limit feedback rod 5.3, the height limit feedback rod 5.3 pushes back the operating device 5.1, the lifting action is stopped, meanwhile, the auxiliary clutch operation 6.3 connected with the lifter 13.1 cuts off the power output of the double-acting clutch 6.1 to the power output assembly 12, and the power output of the power output shaft 12.1 is automatically cut off when the farm tool is lifted to a certain height; thirdly, when the driver operates the operating device 5.1 again to lower the farm tool, the auxiliary clutch operation 6.3 releases the pull-type clutch joint of the double-acting clutch 6.1, the power output assembly 12 is connected with the power again, and the power output shaft 12.1 drives the farm tool to start working.

The above examples are only for illustrating the technical solutions of the present invention, and are not intended to limit the scope of the present invention. But all equivalent changes and modifications within the scope of the present invention should be considered as falling within the scope of the present invention.

Claims

1. A tractor is characterized by comprising a front counterweight assembly (1), a front driving wheel assembly (2), a power assembly (4), a hydraulic system assembly (5), a clutch assembly (6), a steering system assembly (7), a gearbox assembly (8), a control feedback system assembly (10), an electrical system assembly (11), a power output assembly (12), a lifting suspension system assembly (13), a front driving axle assembly (14), a rear driving wheel assembly (16) and a braking system assembly (17); the front counterweight assembly (1) is connected to a bracket of the front driving wheel assembly (2), and the front driving wheel assembly (2) is connected to the front driving axle assembly (14); an engine assembly (4.2) of the power assembly (4) is respectively connected with the hydraulic system assembly (5), the gearbox assembly (8) and the power output assembly (12), the clutch assembly (6) is connected with and controls the power output of the gearbox assembly (8) and the power output assembly (12), the hydraulic system assembly (5) is connected with the lifting suspension system assembly (13), and the electrical system assembly (11) is connected with the engine assembly (4.2); the steering system assembly (7) is connected with the front drive axle assembly (14), and the braking system assembly (17) is connected with the rear drive wheel assembly (16); and an operating device (5.1) of the hydraulic system assembly (5) controls the clutch assembly (6), the power output assembly (12) and the lifting suspension system assembly (13) in a linkage mode through the operating feedback system assembly (10).

2. A tractor according to claim 1, characterized in that it further comprises a hood assembly (3), a floor assembly (9) and a fuel tank assembly (15); the fuel tank assembly (15) is located on the front half portion of the tractor, the hood assembly (3) is fixed on the periphery of the engine assembly (4.2), and the floor assembly (9) is installed above the gearbox assembly (8).

3. A tractor according to claim 1 or 2, characterised in that the power pack (4) comprises a cooling system assembly (4.1), the engine assembly (4.2), an exhaust system assembly (4.3) and an air intake system assembly (4.4); the cooling system assembly (4.1), the exhaust system assembly (4.3) and the air inlet system assembly (4.4) are respectively connected with the engine assembly (4.2).

4. A tractor according to claim 1 or 2, characterized in that the hydraulic system assembly (5) comprises a steering device (5.1), a multi-way valve (5.2), a height limit feedback lever (5.3), a lifter (5.5), a lift cylinder (5.6) and the hydraulic pump (5.8); the operating device (5.1) is connected with a lifter (13.1) of the lifting suspension system assembly (13) through the height limit feedback rod (5.3), and the operating device (5.1) is connected with and controls the flow direction of hydraulic oil of the multi-way valve (5.2) through a flexible shaft; the engine assembly (4.2) is connected with the hydraulic pump (5.8), and the hydraulic pump (5.8) is connected with the lifting oil cylinder (5.6) through the multi-way valve (5.2).

5. A tractor according to claim 4, characterised in that the hydraulic system assembly (5) further comprises a hydraulic output joint (5.4) and an oil filter (5.7); the multi-way valve (5.2) is provided with a plurality of oil outlets, one oil outlet is connected with the hydraulic output joint (5.4), and the hydraulic pump (5.8) is connected with the multi-way valve (5.2) through the oil filter (5.7).

6. A tractor according to claim 1 or 2, characterised in that the clutch assembly (6) comprises a double acting clutch (6.1), a main clutch manoeuvre (6.2) and a secondary clutch manoeuvre (6.3); the main clutch operation (6.2) controls the power input of the gearbox assembly (8), and the auxiliary clutch operation (6.3) controls the power input of the power output assembly (12); a secondary clutch actuation (6.3) is connected to a lifter (13.1) of the lift suspension system assembly (13).

7. A tractor according to claim 1 or 2, characterised in that the steering system assembly (7) comprises a steering gear (7.1), a steering oil can (7.2) and a steering pump (7.3); the engine assembly (4.2) is connected with the steering pump (7.3), the steering pump (7.3) is connected with the steering gear (7.1) through the steering oil can (7.2), and the steering gear (7.1) is connected with the front drive axle assembly (14).

8. A tractor according to claim 1 or 2, characterised in that the gearbox assembly (8) connects the rear drive wheel assembly (16) and the power take off assembly (12) or/and the gearbox assembly (8) connects the front drive axle assembly (14).

9. A tractor according to claim 1 or 2, characterised in that the power take off assembly (12) comprises a power take off shaft (12.1), a speed change gear assembly (12.2) and a speed change manoeuvre (12.3); the speed change operation (12.3) controls the rotation speed of the power output shaft (12.1) through the speed change gear assembly (12.2); when the speed change operation (12.3) is positioned at the lower position, the power output shaft (12.1) is at the low speed, when the speed change operation (12.3) is positioned at the middle position, the power output shaft (12.1) is at the neutral position and does not rotate, and when the speed change operation (12.3) is positioned at the upper position, the power output shaft (12.1) is at the high speed.

10. A tractor according to claim 1 or 2, characterised in that the braking system assembly (17) comprises a brake pedal (17.1), a link (17.2) and a brake (17.3); the brake pedal (17.1) is connected and controls the brake (17.3) through the connecting rod (17.2), and the brake (17.3) is connected with the rear driving wheel assembly (16).