Non-equal-wheel articulated tractor

Abstract

The utility model discloses a non-equal wheel articulated tractor, which comprises a front frame, a rear frame, a power transmission system, a clutch control system, a steering system and an articulated mechanism, the front frame is articulated with the rear frame, the power transmission system is used for transmitting the power of an engine backwards to a gearbox so as to drive the tractor to walk or an agricultural implement to run, and the clutch control system is used for controlling the steering system. The clutch control system is used for controlling a clutch to transmit power of an engine or cut off power transmission, and when the steering system steers, first-stage front wheel steering is conducted firstly, then second-stage middle steering is conducted, and secondary steering is achieved. As the diameter of the front wheels is smaller than that of the rear wheels, the whole vehicle is low in height, good in trafficability and suitable for operation in greenhouses, and the driver view is good. The front axle is installed below the engine through the front axle bracket, the axle distance is shortened, the steering radius is further reduced, steering of the tractor is more flexible, field steering can be completed at a time, and operation efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of tractors, in particular to a non-equal wheel articulated tractor. Background Art

[0002] Tractors are divided into direct-coupled tractors and articulated tractors. Direct-coupled tractors typically use front-wheel steering, with the front axle mounted below and in front of the engine. Their disadvantages are the distance between the front and rear axles, resulting in a large turning radius. For example, a direct-coupled tractor requires two or three reverse turns to achieve a turn at the end of the field. Articulated tractors incorporate an articulated mechanism between the front and rear axles, enabling secondary steering. This results in a smaller turning radius than direct-coupled tractors, but the following issues still exist:

[0003] (1) The distance between the front and rear axles has not changed, and the problem of a large turning radius still exists, which limits the further reduction of the turning radius;

[0004] (2) The diameters of the front and rear wheels are equal. The highest point of the tractor is at the front. The entire machine is too high and cannot be operated in the low places of the greenhouse. It also affects the driver's vision.

[0005] (3) The front wheel diameter is too large, making it difficult for the front wheel to penetrate the soil. The loose soil makes it difficult for the front wheel to provide sufficient friction for turning, resulting in poor steering flexibility.

[0006] (4) When the tractor is equipped with agricultural implements, a large amount of weight is added to the rear wheels, and the center of gravity of the tractor moves backward. The pressure on the ground is much greater than that of the front wheels. If the diameter of the rear wheels is equal to that of the front wheels, the rear wheels may get stuck in the soft ground and be unable to move, making it impossible to carry out plowing, deep loosening, and rotary tillage operations.

[0007] (5) When a tractor is attached to a trailer to transport cargo, the cargo in the trailer will exert great pressure on the rear of the tractor, causing the front of the vehicle to become lighter or even tilted. Therefore, the load borne by the front wheels in actual use is relatively small, and there is no need to use large wheels. Utility Model Content

[0008] In view of the above-mentioned shortcomings, the technical problem to be solved by the present invention is to provide a non-equal wheel articulated tractor with a small turning radius.

[0009] In order to solve the technical problems of the above-mentioned non-equal wheel articulated tractor, the technical solution of the present utility model is:

[0010] The tractor is a non-equal wheel articulated tractor, comprising: a front frame, a rear frame, an engine, a clutch, a gearbox, a power transmission system, a clutch control system, a steering system and an articulated mechanism, wherein the front frame is equipped with a front axle, the front axle is equipped with a front wheel, the rear frame is equipped with a rear axle, and the rear axle is equipped with a rear wheel; the engine body and the clutch housing also serve as the front frame, and the gearbox housing also serves as the rear frame, the articulated mechanism comprises an articulated front articulated bracket and a rear articulated bracket, the front articulated bracket is fixed to the front frame, and the rear articulated bracket is fixed to the rear frame; the diameter of the front wheel is smaller than the diameter of the rear wheel; the front axle is installed directly below the engine through a front axle bracket; the power transmission system comprises a power output assembly and a power output universal joint shaft, the power output assembly is connected to the output end of the clutch, and the power output universal joint shaft is installed at the power output assembly and the gearbox; the clutch operating system includes a clutch pedal, a release rocker arm and a flexible shaft, the clutch pedal is mounted on the rear frame, the release rocker arm is hingedly mounted on the clutch housing and is connected to the power output assembly, and the flexible shaft is arranged between the clutch pedal and the release rocker arm; the steering system includes a front wheel steering cylinder, a middle left steering cylinder and a middle right steering cylinder, the front wheel steering cylinder is mounted on the front axle, the middle left steering cylinder and the middle right steering cylinder are both hinged between the front frame and the rear frame, the middle left steering cylinder is located on the left side of the hinge point of the front frame and the rear frame, and the middle right steering cylinder is located on the right side of the hinge point of the front frame and the rear frame. When steering, the front wheel steering cylinder first drives the front wheel to steer, and then the middle left steering cylinder and the middle right steering cylinder drive the front frame to rotate to complete the secondary middle steering.

[0011] Preferably, the front axle bracket includes: a front bracket, the front bracket includes two front vertical plates arranged relatively spaced apart and a front flat supporting plate fixed between the lower ends of the two front vertical plates, the upper ends of the front vertical plates are mounted on the front frame, and the front support seat of the front axle is mounted on the front flat supporting plate; a rear bracket, the rear bracket includes two rear vertical plates arranged relatively spaced apart and a rear flat supporting plate fixed between the lower ends of the two rear vertical plates, the upper ends of the rear vertical plates are mounted on the front frame, and the rear support seat of the front axle is mounted on the rear flat supporting plate; a connecting plate assembly, the connecting plate assemblies are respectively fixedly connected between the front vertical plates and the rear vertical plates located on the same side.

[0012] Preferably, the front vertical plate is mounted on the body of the engine, and the rear vertical plate is mounted on the housing of the clutch.

[0013] Preferably, the front support seat is located at the front lower part of the front axle, and the rear support seat is located at the rear lower part of the front axle.

[0014] Preferably, the power output assembly includes an output shaft, a release bearing assembly, a sleeve, an output shaft fixing seat and a spline flange; one end of the output shaft extends into the clutch and is connected to the clutch, the release bearing assembly is slidingly sleeved on the sleeve, the release rocker arm is connected to the release bearing assembly, the other end of the output shaft passes through the sleeve and the output shaft fixing seat and is fixedly connected to the spline flange, the sleeve is fixed on the output shaft fixing seat, and the output shaft fixing seat is fixed on the housing of the clutch; the spline flange is fixedly connected to the input shaft of the gearbox.

[0015] Preferably, the gearbox is drivingly connected to a transfer case, and the output shaft of the transfer case is connected to the front axle through a front-wheel drive universal joint shaft.

[0016] Preferably, the release rocker arm is connected to the release bearing assembly.

[0017] Preferably, the steering system also includes: a hydraulic oil tank, a constant flow pump, a steering gear and a solenoid valve; a constant flow pump oil inlet pipe is provided between the hydraulic oil tank and the constant flow pump, a tank return pipe is provided between the hydraulic oil tank and the steering gear, a constant oil pump high-pressure oil pipe is provided between the constant flow pump and the steering gear, a left steering oil pipe and a right steering oil pipe are provided between the steering gear and the solenoid valve, a front axle left steering oil pipe and a front axle right steering oil pipe are provided between the solenoid valve and the front wheel steering cylinder, a middle left steering oil pipe is provided between the solenoid valve and the middle left steering oil cylinder, and a middle right steering oil pipe is provided between the solenoid valve and the middle right steering oil cylinder; a steering conversion switch for controlling the action of the solenoid valve to perform first-level front wheel steering or second-level middle steering is provided on the instrument housing of the tractor.

[0018] Preferably, the middle left steering cylinder and the middle right steering cylinder are single-acting cylinders respectively.

[0019] Preferably, the front axle bracket is fixedly mounted with a water tank bracket, the water tank bracket is fixedly mounted with a counterweight frame, and the counterweight frame is fixed with a hood pad; the tractor's fuel tank is located between the engine and the steering wheel, and the front end of the tractor's hood is mounted on the hood pad via a hinge.

[0020] After adopting the above technical solution, the beneficial effects of the utility model are:

[0021] (1) The utility model adopts a non-equal wheel structure as the overall layout, and reduces the turning radius by means of two-stage steering and optimized front axle position.

[0022] The diameter of the front wheels is smaller than that of the rear wheels, which reduces the load borne by the front wheels, increases the driver's field of vision, reduces damage to the soil when the large-diameter front wheels turn, reduces the torque when the front wheels turn, and makes steering more flexible. The large-diameter rear wheels can withstand greater weight and load, reducing the pressure of the rear wheels on the ground, thereby reducing the destructive effect of the rear wheels on the soil.

[0023] By adding a steering switch to the instrument panel, when the switch is in the primary position, turning the steering wheel achieves primary front-wheel steering. When the switch is in the secondary position, the solenoid valve activates, and turning the steering wheel achieves secondary intermediate steering. When the tractor steers, primary front-wheel steering is performed first, followed by secondary intermediate steering, achieving secondary steering and reducing the tractor's turning radius.

[0024] Installing the front axle directly below the engine reduces the wheelbase between the front and rear axles, further reducing the turning radius and making steering more flexible.

[0025] Direct-drive tractors previously required two or three reversing steps to achieve a turn, but now they can complete the turn in one go, significantly improving operational efficiency. Non-uniform wheel articulated tractors meet the operational needs of paddy fields, small plots, greenhouses, and gardening in southern and central China, filling a domestic gap.

[0026] (2) The utility model realizes the soft clutch operation of the articulated tractor.

[0027] The clutch is located in front of the articulated mechanism, and the clutch pedal is located behind the articulated mechanism. The clutch is connected to the power output assembly. The disengagement rocker arm is connected to the clutch pedal through a flexible shaft, and the disengagement rocker arm is connected to the power output assembly. When the clutch pedal is pressed, the clutch pedal drives the disengagement rocker arm to swing through the flexible shaft, and the disengagement rocker arm drives the power output assembly to move, causing the clutch to disengage, thereby solving the clutch operation problem in the articulated tractor and ensuring smooth clutch operation.

[0028] (3) The utility model realizes the soft transmission of power.

[0029] By adding a power take-off assembly and a power take-off universal joint shaft between the clutch and the gearbox, the power take-off assembly is connected to the clutch, the power take-off assembly is used to receive the power output by the clutch, and the power take-off universal joint shaft is connected between the power take-off assembly and the gearbox. When the articulated tractor performs the secondary intermediate steering, the power take-off universal joint shaft automatically adjusts the angle to adapt to the angle of the articulated mechanism and transmits power to the gearbox, thus solving the problem of the engine transmitting power backward in the articulated tractor. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1This is a schematic diagram of the three-dimensional structure of an embodiment of the non-equal wheel articulated tractor of the present utility model;

[0031] Figure 2 This is a right side structural schematic diagram of an embodiment of the non-equal wheel articulated tractor of the present invention;

[0032] Figure 3 It is a schematic diagram of the relative positions of the steering wheel, fuel tank and hood;

[0033] Figure 4 yes Figure 1 Schematic diagram of the structure of the center front axle support plate;

[0034] Figure 5 Schematic diagram of the assembly structure of the front axle support plate and the front axle;

[0035] Figure 6 It is a structural diagram of the power transmission system;

[0036] Figure 7 It is a schematic diagram of the decomposed structure of the power transmission system;

[0037] Figure 8 It is a schematic diagram of the structure of the clutch control system;

[0038] Figure 9 It is a schematic diagram of the exploded structure of the power output assembly;

[0039] Figure 10 It is a schematic diagram of the steering system;

[0040] In the figure: 1. Front axle; 1a. Front support seat; 1b. Rear support seat; 2. Front wheel; 3. Rear wheel; 4. Engine; 5. Clutch; 6. Gearbox; 7. Front axle bracket; 71. Front vertical plate; 72. Front flat support plate; 73. Rear vertical plate; 74. Rear flat support plate; 75. Connecting plate assembly; 8. Power output assembly; 81. Output shaft; 82. Bushing; 83. Output shaft fixing seat; 84. Spline flange; 85. Release bearing; 86. Bearing seat; 9. Power output universal joint shaft; 10. Clutch pedal; 11. Release rocker arm; 12. Flexible shaft; 13. Front articulated bracket; 14. Rear articulated bracket ;15. Middle left steering cylinder;16. Middle right steering cylinder;17. Transfer case;18. Front drive universal joint shaft;19. Hydraulic oil tank;20. Constant flow pump;21. Steering gear;22. Solenoid valve;23. Constant flow pump oil inlet pipe;24. Oil tank return pipe;25. Constant oil pump high-pressure oil pipe;26. Left steering oil pipe;27. Right steering oil pipe;28. Front axle left steering oil pipe;29. Front axle right steering oil pipe;30. Middle left steering oil pipe;31. Middle right steering oil pipe;32. Fuel tank;33. Steering wheel;34. Engine hood;35. Water tank bracket;36. Counterweight rack;37. Engine hood pad. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0042] like Figure 1 and Figure 2 As shown in the figures, a non-equal wheel articulated tractor comprises: a front frame, a rear frame, an engine 4, a clutch 5, a gearbox 6, a power transmission system, a clutch control system, a steering system and an articulated structure, wherein the front frame is equipped with a front axle 1, which is equipped with a front wheel 2, and the rear frame is equipped with a rear axle, which is equipped with a rear wheel 3;

[0043] The body of the engine 4 and the housing of the clutch 5 also serve as the front frame, and the housing of the gearbox 6 also serves as the rear frame. The articulated mechanism includes an articulated front articulated bracket 13 and a rear articulated bracket 14. The front articulated bracket 14 is fixed to the front frame, and the rear articulated bracket 14 is fixed to the rear frame.

[0044] The diameter of the front wheel 2 is smaller than the diameter of the rear wheel 3;

[0045] like Figure 5 As shown, the front axle 1 is installed directly below the engine 4 through the front axle bracket 7, compared to the prior art where the front axle 1 is installed below the front side of the engine 4;

[0046] like Figure 6 and Figure 7 As shown together, the power transmission system includes a power output assembly 8 and a power output universal joint shaft 9. The power output assembly 8 is connected to the output end of the clutch 5. The power output universal joint shaft 9 is installed between the power output assembly 8 and the gearbox 6. The power of the engine 4 is transmitted to the clutch 5. When the clutch 5 is engaged, the power is transmitted to the power output assembly 8. The power output assembly 8 then transmits the power to the gearbox 6 through the power output universal joint shaft 9. The gearbox 6 outputs power to drive the tractor to move or drive the agricultural machinery to operate;

[0047] like Figure 8 As shown, the clutch operating system includes a clutch pedal 10 rotatably mounted on a rear hinged bracket 14, a release rocker arm 11 hingedly mounted on the housing of the clutch 5, and a flexible shaft 12 connected between the clutch pedal 10 and the release rocker arm 11. When the clutch pedal 10 is depressed, the clutch pedal 10 drives the release rocker arm 11 via the flexible shaft 12, causing the clutch to disengage and cut off power transmission. When the clutch pedal 10 is released, the pedal return spring returns the clutch pedal 10 to its original position, and at the same time, the clutch engages and power transmission is restored.

[0048] like Figure 10As shown, the steering system includes a front wheel steering cylinder, a middle left steering cylinder 15 and a middle right steering cylinder 16. The front wheel steering cylinder is installed on the front axle 1. The middle left steering cylinder 15 and the middle right steering cylinder 16 are both hinged between the front articulated bracket 13 and the rear articulated bracket 14. The middle left steering cylinder 15 is located on the left side of the hinge point of the front articulated bracket 13 and the rear articulated bracket 14, and the middle right steering cylinder 16 is located on the right side of the hinge point of the front articulated bracket 13 and the rear articulated bracket 14. When steering, the front wheel steering cylinder moves first to complete the first-level front wheel steering, and then the middle left steering cylinder 15 and the middle right steering cylinder 16 move to drive the front frame to rotate around the hinge point of the front articulated bracket 13 and the rear articulated bracket 14 to complete the second-level middle steering.

[0049] like Figure 4 and Figure 5 As shown together, the front axle carrier 7 includes:

[0050] The front bracket includes two front vertical plates 71 spaced apart from each other and a front flat support plate 72 fixed between the lower ends of the two front vertical plates 71. The upper ends of the front vertical plates 71 are bolted to the body of the engine 4, and the front support base 1a of the front axle 1 is bolted to the front flat support plate 72.

[0051] The rear bracket includes two rear vertical plates 73 spaced apart from each other and a rear flat supporting plate 74 fixed between the lower ends of the two rear vertical plates 73. The upper end of the rear vertical plate 73 is mounted on the housing of the clutch 5 by bolts, and the rear support seat 1b of the front axle 1 is mounted on the rear flat supporting plate 74.

[0052] The connecting plate 75 is located between the front vertical plate 71 and the rear vertical plate 73 on the same side, and a connecting plate assembly 75 is fixedly connected thereto.

[0053] In order to increase the ground clearance and improve the passability, the front support seat 1a is located at the front lower part of the front axle 1, and the rear support seat 1b is located at the rear lower part of the front axle 1.

[0054] like Figure 9 As shown, the power output assembly 8 includes an output shaft 81, a release bearing assembly, a sleeve 82, an output shaft fixing seat 83 and a spline flange 84;

[0055] One end of the output shaft 81 extends into the clutch and is connected to the clutch 5. The release bearing assembly is slidably mounted on the sleeve 82. The release rocker arm 11 is connected to the release bearing assembly. The other end of the output shaft 81 passes through the sleeve 82 and the output shaft fixing seat 83 and is fixedly connected to the spline flange 84. The sleeve 82 is fixed to the output shaft fixing seat 83, and the output shaft fixing seat 83 is fixed to the housing of the clutch 5. The spline flange 84 is connected to the power output universal joint shaft 9. The sleeve 82 and the output shaft fixing seat 83 are loosely mounted on the output shaft 81, or bearings are provided between the sleeve 82, the output shaft fixing seat 83 and the output shaft 81.

[0056] When the clutch pedal 10 is not depressed, the release bearing assembly is stationary, the clutch 5 is engaged, and power is transmitted to the output shaft 81. The output shaft 81 then transmits the power to the spline flange 84. The spline flange 84 transmits the power backward to the transmission 6 via the power output universal joint 9. When the clutch pedal 10 is depressed, the clutch pedal 10 drives the release rocker arm 11 via the flexible shaft 12, causing the release bearing assembly to slide away from the clutch 5, disengaging the clutch 5 and cutting off power transmission.

[0057] The release bearing assembly includes a release bearing 85 and a bearing seat 86 that are slidably sleeved on the shaft sleeve 82. The release bearing 85 is installed on the bearing seat 86. The release rocker arm 11 is connected to the bearing seat 86. The release bearing 85 is a thrust bearing.

[0058] For a four-wheel drive tractor, the power of the gearbox 6 needs to be transmitted forward to the front axle 1. The gearbox 6 is connected to the transfer case 17. The output shaft of the transfer case 17 is connected to the front axle 1 through the front drive universal joint 18. Part of the power of the gearbox 6 is transmitted to the transfer case 17, and the transfer case 17 is then transmitted forward to the front axle 1 through the front drive universal joint 18 to realize the four-wheel drive of the tractor.

[0059] like Figure 9 As shown, the steering system further includes: a hydraulic oil tank 19, a constant flow pump 20, a steering gear 21 and a solenoid valve 22;

[0060] A constant flow pump oil inlet pipe 23 is provided between the hydraulic oil tank 19 and the constant flow pump 20, a tank return oil pipe 24 is provided between the hydraulic oil tank 19 and the steering gear 21, a constant oil pump high-pressure oil pipe 25 is provided between the constant flow pump 20 and the steering gear 21, a left steering oil pipe 26 and a right steering oil pipe 27 are provided between the steering gear 21 and the solenoid valve 22, a front axle left steering oil pipe 28 and a front axle right steering oil pipe 29 are provided between the solenoid valve 22 and the front wheel steering cylinder, an intermediate left steering oil pipe 30 is provided between the solenoid valve 22 and the intermediate left steering oil cylinder 15, and an intermediate right steering oil pipe 31 is provided between the solenoid valve 22 and the intermediate right steering oil cylinder 16;

[0061] A steering switch for controlling the action of the electromagnetic valve 22 to perform primary front wheel steering or secondary intermediate steering is provided on the instrument housing of the tractor.

[0062] When the steering switch is in the primary steering position, turning the steering wheel enables front wheel steering. When the steering switch is in the secondary steering position, the solenoid valve 22 is activated, and turning the steering wheel enables secondary intermediate steering. When the tractor turns, primary front wheel steering is performed first, followed by secondary intermediate steering, thereby reducing the tractor's turning radius.

[0063] Specifically, the steering principle of the tractor is as follows:

[0064] Front axle left steering principle

[0065] The oil flow direction is: hydraulic oil tank 19-constant flow pump oil inlet pipe 23-constant flow pump 20-constant oil pump high-pressure oil pipe 25-steering gear 21-left steering oil pipe 26-solenoid valve 22-front axle left steering oil pipe 28-front wheel steering cylinder. The front wheel steering cylinder drives the front wheels on the left and right sides to realize the left turn of the tractor.

[0066] The return oil flow direction is: front wheel steering cylinder-front axle right steering oil pipe 29-solenoid valve 22-right steering oil pipe 27-steering gear 21-oil tank return oil pipe 24-hydraulic oil tank 19.

[0067] Front axle right steering principle

[0068] The oil flow direction is: hydraulic oil tank 19-constant flow pump oil inlet pipe 23-constant flow pump 20-constant oil pump high-pressure oil pipe 25-steering gear 21-right steering oil pipe 27-solenoid valve 22-front axle right steering oil pipe 29-front wheel steering cylinder. The front wheel steering cylinder drives the front wheels on the left and right sides to realize the right steering of the tractor.

[0069] The return oil flow direction is: front wheel steering cylinder-front axle left steering oil pipe 28-solenoid valve 22-left steering oil pipe 26-steering gear 21-oil tank return oil pipe 24-hydraulic oil tank 19.

[0070] Center left turn principle

[0071] The middle right steering cylinder 16 extends while the middle left steering cylinder 15 retracts, driving the middle steering mechanism to achieve middle right steering;

[0072] The oil flow direction is: hydraulic oil tank 19 - constant flow pump oil inlet pipe 23 - constant flow pump 20 - constant oil pump high-pressure oil pipe 25 - steering gear 21 - right steering oil pipe 27 - solenoid valve 22 - middle right steering oil pipe 31 - middle right steering cylinder 16;

[0073] The return oil flow direction is: middle left steering cylinder 15 - middle left steering oil pipe 30 - solenoid valve 22 - left steering oil pipe 26 - steering gear 21 - oil tank return oil pipe 24 - hydraulic oil tank 19.

[0074] Center right turn principle

[0075] The middle left steering cylinder 15 extends while the middle right steering cylinder 16 retracts, driving the middle steering mechanism to achieve middle left steering;

[0076] The oil flow direction is: hydraulic oil tank 19 - constant flow pump oil inlet pipe 23 - constant flow pump 20 - constant oil pump high-pressure oil pipe 25 - steering gear 21 - left steering oil pipe 26 - solenoid valve 22 - middle left steering oil pipe 30 - middle left steering cylinder 15;

[0077] The return oil flow direction is: middle right steering cylinder 16 - middle right steering oil pipe 31 - solenoid valve 22 - right steering oil pipe 27 - steering gear 21 - oil tank return oil pipe 24 - hydraulic oil tank 19.

[0078] The middle left steering cylinder 15 and the middle right steering cylinder 16 are single-acting cylinders respectively. The middle left steering oil pipe 30 is communicated with the rodless cavity of the middle left steering oil cylinder 15 , and the middle right steering oil pipe 31 is communicated with the rodless cavity of the middle right steering oil cylinder 16 .

[0079] like Figure 3 As shown, the front axle bracket 7 is fixedly mounted with a water tank bracket 35, the water tank bracket 35 is fixedly mounted with a counterweight frame 36, and the counterweight frame 36 is fixed with a hood pad 37; the tractor's fuel tank 32 is located between the engine 4 and the steering wheel 33, and the front end of the tractor's hood 34 is hingedly mounted on the hood pad 37. When the hood 34 is opened, it flips forward, reducing the overall length of the machine.

[0080] The above are examples of the best embodiments of the present invention. Any parts not described in detail are common knowledge of those skilled in the art. The scope of protection of the present invention is based on the content of the claims. Any equivalent transformation based on the technical teachings of the present invention is also within the scope of protection of the present invention.

Claims

1. An articulated tractor with non-equal wheels, comprising: A front frame, a rear frame, an engine, a clutch, a gearbox, a power transmission system, a clutch control system, a steering system and an articulated mechanism, wherein the front frame is equipped with a front axle, the front axle is equipped with a front wheel, the rear frame is equipped with a rear axle, the rear axle is equipped with a rear wheel, and the vehicle is characterized in that: The engine body and the clutch housing also serve as the front frame, the gearbox housing also serves as the rear frame, the articulated mechanism includes an articulated front articulated bracket and a rear articulated bracket, the front articulated bracket is fixed to the front frame, and the rear articulated bracket is fixed to the rear frame; The front wheel diameter is smaller than the rear wheel diameter; The front axle is installed directly below the engine via a front axle bracket; The power transmission system includes a power output assembly and a power output universal joint transmission shaft, wherein the power output assembly is connected to the output end of the clutch, and the power output universal joint transmission shaft is installed between the power output assembly and the gearbox; The clutch operating system includes a clutch pedal, a release rocker arm, and a flexible shaft. The clutch pedal is mounted on the rear frame. The release rocker arm is hingedly mounted on the clutch housing and connected to the power output assembly. The flexible shaft is provided between the clutch pedal and the release rocker arm. The steering system includes a front wheel steering cylinder, a middle left steering cylinder and a middle right steering cylinder. The front wheel steering cylinder is installed on the front axle. The middle left steering cylinder and the middle right steering cylinder are both hinged between the front frame and the rear frame. The middle left steering cylinder is located on the left side of the hinge point between the front frame and the rear frame, and the middle right steering cylinder is located on the right side of the hinge point between the front frame and the rear frame. When steering, the front wheel steering cylinder first drives the front wheels to steer, and then the middle left steering cylinder and the middle right steering cylinder drive the front frame to rotate to complete the secondary middle steering.

2. The unequal wheel articulated tractor according to claim 1, characterized in that: The front axle bracket includes: A front bracket, the front bracket comprising two front uprights spaced apart from each other and a front flat support plate fixed between the lower ends of the two front uprights, the upper ends of the front uprights being mounted on the front frame, and the front support seat of the front axle being mounted on the front flat support plate; A rear bracket, the rear bracket comprising two rear uprights spaced apart from each other and a rear flat support plate fixed between the lower ends of the two rear uprights, the upper ends of the rear uprights being mounted on the front frame, and the rear support seat of the front axle being mounted on the rear flat support plate; A connecting plate assembly is fixedly connected between the front vertical plate and the rear vertical plate located on the same side.

3. The unequal wheel articulated tractor according to claim 2, characterized in that: The front vertical plate is installed on the body of the engine, and the rear vertical plate is installed on the housing of the clutch.

4. The unequal wheel articulated tractor according to claim 2, characterized in that: The front support seat is located at the front lower part of the front axle, and the rear support seat is located at the rear lower part of the front axle.

5. The unequal wheel articulated tractor according to claim 1, characterized in that: The power output assembly includes an output shaft, a release bearing assembly, a sleeve, an output shaft fixing seat and a spline flange; One end of the output shaft extends into the clutch and is connected to the clutch, the release bearing assembly is slidingly sleeved on the shaft sleeve, the release rocker arm is connected to the release bearing assembly, the other end of the output shaft passes through the shaft sleeve and the output shaft fixing seat and is fixedly connected to the spline flange, the shaft sleeve is fixed to the output shaft fixing seat, and the output shaft fixing seat is fixed to the clutch housing; The spline flange is fixedly connected to the input shaft of the gearbox.

6. The unequal wheel articulated tractor according to claim 5, characterized in that: The gearbox is drivingly connected to a transfer case, and the output shaft of the transfer case is connected to the front axle through a front-drive universal joint shaft.

7. The unequal wheel articulated tractor according to claim 6, characterized in that: The release rocker arm is connected to the release bearing assembly.

8. The unequal wheel articulated tractor according to claim 1, characterized in that: The steering system also includes: a hydraulic oil tank, a constant flow pump, a steering gear and a solenoid valve; A constant flow pump oil inlet pipe is provided between the hydraulic oil tank and the constant flow pump, an oil tank return pipe is provided between the hydraulic oil tank and the steering gear, a constant oil pump high-pressure oil pipe is provided between the constant flow pump and the steering gear, a left steering oil pipe and a right steering oil pipe are provided between the steering gear and the solenoid valve, a front axle left steering oil pipe and a front axle right steering oil pipe are provided between the solenoid valve and the front wheel steering oil cylinder, an intermediate left steering oil pipe is provided between the solenoid valve and the intermediate left steering oil cylinder, and an intermediate right steering oil pipe is provided between the solenoid valve and the intermediate right steering oil cylinder; A steering switch for controlling the action of the electromagnetic valve to perform primary front wheel steering or secondary intermediate steering is provided on the instrument housing of the tractor.

9. The unequal wheel articulated tractor according to claim 1, characterized in that: The middle left steering cylinder and the middle right steering cylinder are single-acting cylinders respectively.

10. The unequal wheel articulated tractor according to claim 2, characterized in that: The front axle bracket is fixedly mounted with a water tank bracket, the water tank bracket is fixedly mounted with a counterweight frame, and the counterweight frame is fixed with a hood pad; The fuel tank of the tractor is located between the engine and the steering wheel, and the front end of the hood of the tractor is mounted on the hood pad through a hinge.

Images