A method for regulating the traction passability of a tractor

Abstract

The present application belongs to the technical field of tractors, and relates to a method for regulating the traction passability of a tractor, comprising: taking the connection point between the tractor and the towed object as the traction point, changing the traction point height and / or changing the suspension height to adjust the axle load distribution of the tractor, realizing the regulation of the traction passability of the road surface, and enabling the tractor to pass through different types of soil; the different types of soil include: high compressibility soil, medium compressibility soil and low compressibility soil; E s Soil with a compressibility of less than 4MPa is considered highly compressible soil. E s Soil with a compressibility of ≤15MPa is medium compressible soil. E s Soil with a compressibility greater than 15 MPa is considered low compressibility soil. The present invention can improve traction by changing the traction position.

Description

Technical Field

[0001] The present application relates to the technical field of tractors, and in particular to a method for regulating the traction performance of a tractor. Background Art

[0002] At present, the tractor industry is in a stage of rapid development, with a continuously expanding market scale, obvious technological trends and fierce competition. In the future, with the continuous promotion of new energy policies and the continuous advancement of technology, the tractor industry will usher in a broader development prospect.

[0003] Generally, tractors include civilian tractors and military tractors.

[0004] Civilian tractors are mainly used for cargo transportation, including long-distance transportation and heavy-load transportation. Their design often focuses more on economic benefits, fuel efficiency and driving comfort, but also has certain requirements for passability on soft roads.

[0005] Military tractors pay more attention to their passability and survivability in complex and harsh environments, especially traction on soft roads.

[0006] The soft-road traction performance of a traction vehicle determines whether the vehicle can smoothly pass through some unpaved roads with poor conditions, so how to enhance its soft-road traction performance has received more and more research.

[0007] In the prior art, research on vehicle traction on soft roads mainly focuses on the configuration optimization of tires and tracks, which requires a lot of R&D costs and is difficult to update. At the same time, the configuration often has better traction on a certain type of soil road surface and is difficult to adapt to different types of soil. Summary of the invention

[0008] Based on this, it is necessary to provide a method for regulating the traction performance of a tractor in order to solve the above technical problems, which can improve the traction force by changing the traction position.

[0009] A method for regulating the traction passability of a tractor, comprising: taking the connection point between the tractor and the towed object as the traction point, changing the traction point height and / or changing the suspension height to adjust the axle load distribution of the tractor, realizing the regulation of the traction passability of the road surface, and enabling the tractor to pass through different types of soil.

[0010] In one embodiment, the different types of soil include: high compressibility soil, medium compressibility soil, and low compressibility soil;

[0011] by E s Soil with a compressibility of less than 4MPa is considered highly compressible soil. E sSoil with a compressibility of ≤15MPa is medium compressible soil. E s Soil with a compressibility of >15MPa is low compressibility soil, among which: E s is the compression modulus.

[0012] In one embodiment, the high compressibility soil includes: heavy clay with different moisture content; the medium compressibility soil includes: light clay with different moisture content; the low compressibility soil includes: sandy loam with different moisture content;

[0013] Clay with a clay content greater than or equal to 60% is considered heavy clay, and clay with a clay content less than 60% is considered light clay.

[0014] In one embodiment, when a tractor passes through heavy clay with different moisture levels, as the moisture level increases:

[0015] Raise the height of the towing point to reduce the front wheel axle load of the tractor and increase the rear wheel axle load of the tractor, thereby reducing the front wheel traction passability and improving the rear wheel traction passability;

[0016] And / or the front suspension is extended and the rear suspension is compressed while reducing the travel difference of the suspension to reduce the front wheel axle load of the tractor and increase the rear wheel axle load of the tractor, thereby reducing the traction passability of the front wheel and improving the traction passability of the rear wheel.

[0017] In one embodiment, when a tractor passes through light clay with different moisture levels, as the moisture level increases:

[0018] Raise the height of the towing point to reduce the front wheel axle load of the tractor and increase the rear wheel axle load of the tractor, thereby reducing the front wheel traction passability and improving the rear wheel traction passability;

[0019] And / or the front suspension is equal to the rear suspension in height, so as to reduce the front wheel axle load of the tractor and increase the rear wheel axle load of the tractor, thereby reducing the traction passability of the front wheel and improving the traction passability of the rear wheel.

[0020] In one embodiment, when a tractor passes through sandy soil with different humidity levels, as the humidity decreases:

[0021] Lower the height of the towing point to increase the front wheel axle load of the tractor and reduce the rear wheel axle load of the tractor, thereby improving the traction passability of the front wheel and reducing the traction passability of the rear wheel;

[0022] And / or the front suspension is compressed and the rear suspension is stretched, and the travel difference of the suspension is increased at the same time, so as to increase the front wheel axle load of the tractor and reduce the rear wheel axle load of the tractor, thereby improving the traction passability of the front wheel and reducing the traction passability of the rear wheel.

[0023] In one embodiment, increasing the height of the traction point includes: increasing the height of the traction point and the horizontal angle of the traction line satisfies .

[0024] In one embodiment, lowering the height of the traction point includes: lowering the height of the traction point and the horizontal angle of the traction line satisfies .

[0025] In one embodiment, the tractor comprises a wheeled vehicle or a tracked vehicle.

[0026] In one embodiment, the tractor includes a two-axle tractor and a multi-axle tractor.

[0027] The above-mentioned method for regulating the traction passability of a tractor can adjust the load distribution of different axles of the tractor by changing the traction position, that is, the height of the traction point and / or the suspension height, to regulate the road traction passability, and can especially enhance the soft road traction passability of an amphibious tractor, achieve an increase in traction force, and enable the front and rear axles of the vehicle to maintain sufficient traction passability, thereby enabling the tractor to successfully pass through different types of soil, thereby improving the vehicle's adaptability to complex soil conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of a vehicle force model in an embodiment;

[0029] Figure 2 In one embodiment, the difference in axle load between the front and rear axles is Schematic diagram of angle changes;

[0030] Figure 3 A coupling model diagram of different towing points of an amphibious vehicle in one embodiment;

[0031] Figure 4 is a diagram showing the axle load distribution results of the front and rear axles at different traction points in one embodiment;

[0032] Figure 5 is a geometric diagram of the deformation of an oil-gas spring in one embodiment;

[0033] Figure 6 This is a graph showing the effect of the expansion and contraction of the oil and gas springs on the axle load in an embodiment. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0035] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "multiple groups" means at least two groups, such as two groups, three groups, etc., unless otherwise clearly and specifically defined.

[0036] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] In addition, the technical solutions between the various embodiments of the present application can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0038] The present application provides a method for regulating the traction passability of a tractor. In one embodiment, the method comprises: taking the connection point between the tractor and the towed object as the traction point, changing the traction point height and / or changing the suspension height, that is, changing the traction point height, or changing the suspension height, or changing the traction point height and the suspension height at the same time, so as to adjust the axle load distribution of the tractor, realize the regulation of the traction passability of the road surface, and enable the tractor to pass through different types of soil.

[0039] In one embodiment, different types of soils include: high compressibility soil, medium compressibility soil and low compressibility soil according to the different compressibility of the soil; specifically: E s Soil with a compressibility of less than 4MPa is considered highly compressible soil. E s Soil with a compressibility of ≤15MPa is medium compressible soil. E s Soil with a compressibility of >15MPa is low compressibility soil, among which: E s The compression modulus, in Pa, refers to the ratio of the vertical additional stress of the soil under full lateral confinement conditions to the corresponding strain increment, which is used to measure the compressibility of the soil. Es The larger it is, the less compressible the soil is.

[0040] Among them, highly compressible soils include: heavy clay at different moisture levels; medium compressible soils include: light clay at different moisture levels; and low compressible soils include: sandy loam at different moisture levels.

[0041] Specifically: Different types of soil have different compressibility, which affects the traction and passability of multi-axle vehicles. For the same type of soil, when measuring soil compressibility, water content is an important influencing factor. The higher the water content, the more water content in the pores, and the more water discharged during compression, so the compression deformation will be greater and the compressibility will be better, but too high a water content may also lead to a decrease in soil stability.

[0042] Heavy clay is clay with a clay content greater than or equal to 60%. After being crushed by the wheels, the clay particles will form a bond, the soil density will increase, and the soil bearing strength and shear strength will increase accordingly; the gaps between the particles are small and the bonding force is strong, the water permeability is poor, and it is difficult for water to quickly penetrate and discharge in the soil. The water stays in the soil for a long time, further increasing the compression deformation, so the compressibility is relatively good, and it is a highly compressible soil.

[0043] Light clay is clay with a clay content of less than 60%, and the clay content is between heavy clay and sandy loam. The gaps and binding force between particles are also at a medium level. Under appropriate moisture conditions, it has good plasticity and can be molded into various shapes. When light clay is subjected to pressure, its compressibility is between heavy clay and sandy loam. The gaps between particles will be compressed, but its compression deformation is smaller than that of heavy clay. Therefore, its compressibility is between heavy clay and sandy loam, and it is a medium compressible soil.

[0044] Sandy loam is mainly composed of larger sand particles. The gaps between the particles are relatively large, and the water permeability is strong, so water can easily penetrate and discharge. When under pressure, water and air are easily squeezed out, but the particles themselves are not prone to significant compression deformation. Their compressibility is relatively small, so they are low-compressibility soils, such as: water-sand mixtures, wet sand, dry sand, and loose soft stone roads.

[0045] In addition, the rutting of the vehicle is an important factor affecting the traction and passability of the vehicle. The influence of rutting on different types of soil is completely different. If it is a highly compressible soil, after being compacted by the wheels, the bearing strength increases, the wheel settlement decreases when passing again, and the driving resistance decreases; when driving in a straight line on highly compressible soil, the traction and passability of the front axle wheels is the worst, and the traction and passability of the rear axle wheels is better. If it is a low-compressible soil, after being disturbed by the wheels, the soil structure is destroyed, the bearing strength decreases, and the wheel settlement increases when passing again, and the driving resistance increases; when driving in a straight line on low-compressible soil, the traction and passability of the front wheels is the best, and the traction and passability of the rear axle wheels is poor.

[0046] Therefore, when the vehicle is traveling, the wheel traction increases as the wheel load increases. Timely changing the traction point height and / or the suspension height, thereby changing the axle load distribution of the front and rear axles, can improve the vehicle's passability.

[0047] It is assumed that the soil on which the tractor is driving is the first time, no other vehicle has driven on it before, and the tractor is driving in a straight line.

[0048] 1) When a tractor passes through highly compressible soil, that is, heavy clay with different moisture levels, if the rear axle wheels or tracks pass through the ruts of the front axle wheels, the traction force will increase significantly. The traction force generated by the unit load of the rear axle is greater than that of the front axle. The traction of the front axle wheels is poor, while the traction of the rear axle wheels is better. For this reason:

[0049] As the moisture content of heavy clay increases, the height of the towing point is increased, and the front axle load is transferred to the rear axle to reduce the front axle load (front axle wheel load) of the tractor and increase the rear axle load (rear axle wheel load) of the tractor, thereby reducing the front wheel traction passability and increasing the rear wheel traction passability, thereby improving the traction passability;

[0050] Or, as the moisture content of the heavy clay increases, the front suspension is extended and the rear suspension is compressed, while the travel difference of the suspension is reduced, so as to reduce the front axle load (front axle wheel load) of the tractor and increase the rear axle load (rear axle wheel load) of the tractor, thereby reducing the traction passability of the front wheel and increasing the traction passability of the rear wheel, thereby improving the traction passability;

[0051] Alternatively, as the moisture content of the heavy clay increases, the height of the towing point is increased, the front suspension is extended and the rear suspension is compressed while reducing the travel difference of the suspension, transferring the front axle load to the rear axle to further reduce the front axle load (front axle wheel load) of the tractor and increase the rear axle load (rear axle wheel load) of the tractor, thereby reducing the front wheel traction passability and improving the rear wheel traction passability, further improving the traction passability.

[0052] 2) When the tractor passes through medium compressible soil, that is, light clay with different moisture content:

[0053] As the moisture content of light clay increases, the height of the towing point is increased, and the front axle load is transferred to the rear axle to reduce the front axle load (front axle wheel load) of the tractor and increase the rear axle load (rear axle wheel load) of the tractor, thereby reducing the front wheel traction passability and increasing the rear wheel traction passability, thereby improving the traction passability;

[0054] Or, as the moisture content of light clay increases, the front suspension and rear suspension are kept at the same height to reduce the front axle load (front axle wheel load) of the tractor and increase the rear axle load (rear axle wheel load) of the tractor, thereby reducing the front wheel traction passability and increasing the rear wheel traction passability, thereby improving the traction passability;

[0055] Alternatively, as the moisture content of light clay increases, the height of the towing point is increased, the front suspension and rear suspension are kept at the same height, and the front axle load is transferred to the rear axle to further reduce the front axle load (front axle wheel load) of the tractor and increase the rear axle load (rear axle wheel load) of the tractor, thereby reducing the front wheel traction passability and improving the rear wheel traction passability, further improving the traction passability.

[0056] 3) When the tractor passes through low-compressibility soil, that is, sandy loam with different humidity, if the rear axle wheels or tracks pass through the ruts of the front axle wheels, the traction force will drop significantly. The traction force generated by the unit load of the rear axle is less than that of the front axle. The front axle wheels have the best traction performance, while the rear axle wheels have the poorest traction performance. For this reason:

[0057] As humidity decreases, the height of the towing point is lowered, and the rear axle load is transferred to the front axle to increase the front axle load (front axle wheel load) of the tractor and reduce the rear axle load (rear axle wheel load) of the tractor, thereby improving the traction passability of the front wheels and reducing the traction passability of the rear wheels, thereby improving the traction passability;

[0058] Or, as the humidity decreases, the front suspension is compressed and the rear suspension is stretched, and the travel difference of the suspension is increased, so as to increase the front axle load (front axle wheel load) of the tractor and reduce the rear axle load (rear axle wheel load) of the tractor, thereby improving the traction passability of the front wheels and reducing the traction passability of the rear wheels, thereby improving the traction passability;

[0059] Or, as the humidity decreases, the height of the towing point is lowered, the front suspension is compressed and the rear suspension is extended, and the travel difference of the suspension is increased, so as to transfer the rear axle load to the front axle, so as to further increase the front axle load of the tractor (front axle wheel load) and reduce the rear axle load of the tractor (rear axle wheel load), thereby improving the traction passability of the front wheel and reducing the traction passability of the rear wheel, and further improving the traction passability.

[0060] Among them, increasing the height of the traction point includes: increasing the height of the traction point and the horizontal angle of the traction line meets , reducing the height of the traction point includes: reducing the height of the traction point and the horizontal angle of the traction line meets , and the horizontal angle of the traction line satisfies When the rear axle load is too large, it is not conducive to vehicle driving and cannot be used as a towing point.

[0061] Note: When the unmanned platform is driving in a straight line on heavy clay, it is more compressible than light clay, so more load needs to be diverted to the rear axle.

[0062] It should also be noted that the driving conditions of the tractor are mainly straight driving and small-range turning. When the vehicle turns in a small range, there will still be overlap of ruts, so it is still applicable.

[0063] In one embodiment, the tractor includes a wheeled vehicle (tire vehicle) and a tracked vehicle. That is, whether it is a wheeled vehicle or a tracked vehicle, changing the height of the traction point and / or adjusting the suspension height of the front and rear axles has a universal effect on the axle load distribution, regardless of whether the vehicle uses tires or tracks as a traveling mechanism. Therefore, this adjustment method is applicable to both types of vehicles.

[0064] In one embodiment, the tractor includes a two-axle tractor and a multi-axle tractor. For a multi-axle tractor, the tension applied by the traction rope will directly lead to the redistribution of the force of each axle acting vertically on the ground, thereby causing the transfer of axle load; in addition, by adjusting the suspension height of each axle, a certain torque effect can be generated on each axle, which will also promote the transfer of axle load between the axles; given that both mechanisms can effectively affect the axle load distribution of a multi-axle vehicle, the adjustment strategy of the present application is also applicable to a multi-axle vehicle.

[0065] The above-mentioned method for regulating the traction passability of a tractor can adjust the load distribution of different axles of the tractor by changing the traction position, that is, the height of the traction point and / or the suspension height, to regulate the road traction passability, and can especially enhance the soft road traction passability of an amphibious tractor, achieve an increase in traction force, and enable the front and rear axles of the vehicle to maintain sufficient traction passability, thereby enabling the tractor to successfully pass through different types of soil, thereby improving the vehicle's adaptability to complex soil conditions.

[0066] In a specific embodiment, large equipment needs to provide a large amount of fuel when operating on an island. The fuel is usually transported by pipeline. This method requires the pipeline to be towed to the island by a transport ship. The pipeline towing method is that the towing ship tows the pipeline to the shore, and then the amphibious tractor tows the pipeline from the water to the land. In this process, the vehicle must pass through different road properties such as water-sand mixture, wet sand, dry sand, loose soft stone road surface, light clay with different humidity and heavy clay.

[0067] Taking an amphibious tractor as an example, three types of soil pavement, namely sandy loam, light clay and heavy clay, were analyzed.

[0068] like Figure 1The schematic diagram of the vehicle force model is shown. When the amphibious tractor is towing the oil pipe, the towing load generated by the oil pipe will affect the axle load distribution of the amphibious vehicle, and then affect the towing capacity of the amphibious vehicle. Different towing heights of the amphibious vehicle will produce different axle load transfers, and the influence of different towing point positions on the front and rear axle loads is analyzed.

[0069] Assumption: The vehicle weight is =4000kg, track center of gravity is 498mm above the ground, wheelbase is 3000mm, carriage height is 1400mm, oil pipe towing point is 100mm above the ground =950mm, the distance between the amphibious vehicle and the oil pipe vehicle =3000mm, a, b, c, d, e are different traction points. For example, the pulling force of the traction rope The horizontal angle with the road surface is , the front axle load is , the rear axle load is .

[0070] The force balance is:

[0071] ;

[0072] Torque balance:

[0073] ;

[0074] We can get:

[0075] ;

[0076] ;

[0077] It can be seen that the position of the towing point will affect the traction torque of the amphibious vehicle caused by the tension of the towing rope, which will further affect the distribution of the front and rear axle loads of the amphibious vehicle.

[0078] like Figure 2 The difference in axle load between the front and rear axles is shown as Schematic diagram of the change of angle. When the total axle load remains unchanged, the angle As the traction point increases, the front axle load becomes smaller, the rear axle load becomes larger, and the difference between the two axle loads becomes larger. , the vehicle load is transferred more to the rear axle, as the towing point position changes from high to low and meets , the vehicle load is transferred more to the front axle, and when the towing point position meets When the rear axle load is too large, it is not conducive to vehicle driving and is not considered as a towing point.

[0079] like Figure 3The coupling model diagram of different towing points of the amphibious vehicle is shown. The dynamic model of the vehicle is established in Recurdyn, and different spring action points are set at the rear of the vehicle body to simulate the towing process of different towing points of the amphibious vehicle, and coupled simulation is performed with Edem.

[0080] Pick Figure 3 The simulation analysis of the six different action positions from a to e can obtain the axle load distribution results of the front and rear axles at different traction points as shown in the figure below. Figure 4 From the simulation results, we can see that as the towing point a changes to point e, the axle load of the rear axle increases, the axle load of the front axle decreases, and the axle load difference between the front and rear axles becomes larger and larger, which verifies the conclusion drawn from theoretical analysis that the greater the axle load difference between the front and rear axles is, the greater the towing point is from bottom to top.

[0081] The suspension height adjustment can also change the axle load of each axle. In the initial state of the unmanned platform, the intermediate shaft is in the initial position, the travel of each suspension oil and gas spring is at the middle travel of 125mm, the telescopic travel of the oil and gas spring is 250mm, and the active travel of each axle oil and gas spring relative to the initial position is , , positive value indicates extension stroke, negative value indicates compression stroke, and the difference between rear and front suspension stroke is , As the oil and gas springs actively expand and contract and the intermediate shaft moves, the body posture of the unmanned platform will inevitably change, and the deformation of each oil and gas spring will change accordingly. The geometric relationship diagram of the oil and gas spring deformation is shown in the figure below: Figure 5 shown.

[0082] Assume that the height of the vehicle's center of gravity remains unchanged at this time, which is , vehicle weight =4000kg, the weight of the track wheel is transferred to the vehicle body for calculation, F 1 represents the front axle suspension spring force, F 2 represents the rear axle suspension spring force, W 1 represents the front axle load, W 2 Indicates the rear axle load. , .

[0083] The vehicle inclination angle is calculated as follows:

[0084] ;

[0085] In the formula, is the wheelbase, is the horizontal inclination angle of the vehicle;

[0086] From the force balance we get:

[0087] ;

[0088] From the moment balance we get:

[0089] ;

[0090] Solving the above equations, we can get the axle loads of each axis:

[0091] ;

[0092] ;

[0093] After substituting the structural parameters of the driving system into the above formula, the influence of the expansion and contraction of the oil and gas spring of each axle on the axle load can be calculated as shown in the figure below: Figure 6 As shown. Figure 6 It can be seen that when the rear axle suspension is compressed and the front axle suspension is extended, the travel difference is negative, and when the rear axle suspension is extended and the front axle suspension is compressed, the travel difference is positive. As the travel difference increases, the front axle load increases and the rear axle load decreases. Therefore, when the suspension height of one axle is greater than that of the other axle, the load tends to transfer to the other axle suspension.

[0094] Different towing point heights and different suspension heights have different effects on axle load transfer. By configuring different towing point heights and suspension heights, the axle load distribution of the front and rear axles of the vehicle can be effectively changed to adapt to soils with different compression properties and improve the vehicle's traction and passability.

[0095] In order to simplify the analysis, three traction point heights are combined with three suspension heights to form nine configurations for illustration. Among them, the three traction point heights are measured by the angle between the traction rope tension and the road surface, and the angles are -10°, -5°, and 0° respectively; the three suspension heights are: the rear axle suspension is extended by 0.125m, the front axle suspension is compressed by 0.125m; the rear axle suspension is compressed by 0.125m, the front axle suspension is extended by 0.125m; the two axle suspensions are of equal height. Nine configurations are listed, as shown in Table 1.

[0096] Table 1: 9 configurations

[0097]

[0098] According to the axle load calculation formula obtained by analysis, the axle load distribution of each configuration is calculated respectively, as shown in Table 2.

[0099] Table 2: Axle load distribution of each configuration

[0100]

[0101] Therefore, configuration a is used when driving on sandy soil with low humidity (water content <9%), configuration b is used when driving on sandy soil with normal humidity (9% < water content <15%), and configuration c is used when driving on sandy soil with high humidity (water content >15%).

[0102] Configuration g is used when driving on light clay with low humidity (moisture content <16%), configuration h is used when driving on light clay with normal humidity (16%<moisture content<22%), and configuration i is used when driving on light clay with high humidity (moisture content>22%).

[0103] Configuration d is used when driving on heavy clay with low humidity (moisture content <15%), configuration e is used when driving on heavy clay with normal humidity (15%<moisture content<25%), and configuration f is used when driving on heavy clay with high humidity (moisture content>25%).

[0104] It should be noted that the 9 configurations here are just examples. In actual applications, the towing point position and suspension height can be adjusted in real time according to specific soil conditions and specific vehicle parameters to design different configurations to adapt to different soil environments.

[0105] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0106] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0107] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A method for regulating the traction performance of a tractor, characterized in that: include: Taking the connection point between the tractor and the towed object as the traction point, changing the traction point height and / or the suspension height to adjust the axle load distribution of the tractor, realize the regulation of the road traction passability, and enable the tractor to pass through different types of soil; Different types of soils include: highly compressible soils, moderately compressible soils, and low compressible soils; by E s Soil with a compressibility of less than 4MPa is considered highly compressible soil. E s Soil with a compressibility of ≤15MPa is medium compressible soil. E s Soil with a compressibility of >15MPa is low compressibility soil, among which: E s is the compression modulus; The high compressibility soil includes: heavy clay with different humidity; the medium compressibility soil includes: light clay with different humidity; the low compressibility soil includes: sandy loam with different humidity; Clay with a clay content of 60% or more is considered heavy clay, and clay with a clay content of less than 60% is considered light clay. When a tractor passes through heavy clay with different moisture levels, as the moisture level increases: Raise the height of the towing point to reduce the front wheel axle load of the tractor and increase the rear wheel axle load of the tractor, thereby reducing the front wheel traction and improving the rear wheel traction; and / or the front suspension is extended and the rear suspension is compressed while reducing the travel difference of the suspension, so as to reduce the axle load of the front wheels of the tractor and increase the axle load of the rear wheels of the tractor, thereby reducing the traction passability of the front wheels and improving the traction passability of the rear wheels; When a tractor passes through light clay with different humidity levels, as the humidity increases: Raise the height of the towing point to reduce the front wheel axle load of the tractor and increase the rear wheel axle load of the tractor, thereby reducing the front wheel traction and improving the rear wheel traction; and / or the front suspension and the rear suspension are of the same height, so as to reduce the front wheel axle load of the tractor and increase the rear wheel axle load of the tractor, thereby reducing the traction passability of the front wheel and improving the traction passability of the rear wheel; When a tractor passes through sandy soil with different humidity levels, as the humidity decreases: Lower the height of the towing point to increase the front wheel axle load of the tractor and reduce the rear wheel axle load of the tractor, thereby improving the traction passability of the front wheel and reducing the traction passability of the rear wheel; And / or the front suspension is compressed and the rear suspension is stretched, and the travel difference of the suspension is increased at the same time, so as to increase the front wheel axle load of the tractor and reduce the rear wheel axle load of the tractor, thereby improving the traction passability of the front wheel and reducing the traction passability of the rear wheel.

2. A method for regulating the traction performance of a tractor according to claim 1, characterized in that: Increasing the height of the traction point includes: increasing the height of the traction point and the horizontal angle of the traction line meets .

3. A method for regulating the traction performance of a tractor according to claim 2, characterized in that: Lowering the traction point height includes: lowering the traction point height and the horizontal angle of the traction line meets .

4. A method for regulating the traction performance of a tractor according to any one of claims 1 to 3, characterized in that: The tractor includes a wheeled vehicle or a tracked vehicle.

5. A method for regulating the traction performance of a tractor according to any one of claims 1 to 3, characterized in that: The tractor includes a two-axle tractor and a multi-axle tractor.

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