Design method of light truck tire

Abstract

The application provides a design method of a light truck tire, relates to the technical field of tire design, and comprises the following steps: collecting the use environment data of the light truck tire, and generating the working parameter requirement of the light truck tire; then generating the contour data of the light truck tire; further generating the size data and preliminary material selection of each part structure of the light truck tire; finally generating a preliminary model; adjusting the preliminary model after simulation analysis to obtain a production model; selecting the tire pattern and the use air pressure range of the light truck tire based on the working parameter requirement of the light truck tire; adding the tire pattern and the use air pressure range of the light truck tire to the production model; producing a sample tire based on the production model, and detecting and verifying the design effect on site. Through the investigation on the use environment of the light truck tire, the accuracy of the working parameter requirement of the light truck tire is improved, through the comprehensive consideration of multiple factors such as the material, structure and pattern of the tire, and the mutual influence relationship among each part structure, the comprehensive improvement of the performance of the tire is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tire design, and particularly relates to a design method of a light truck tire. BACKGROUND

[0002] As a key component connecting vehicles and roads, the performance of a light truck tire directly affects the driving safety, stability and comfort of the vehicle. However, the traditional tire design method often focuses on the improvement of a single structural performance, and ignores the balance and optimization between the structures of the tire. SUMMARY

[0003] The present application provides a design method of a light truck tire, which solves the defect that the traditional tire design method in the prior art often focuses on the improvement of a single structural performance, and ignores the balance and optimization between the structures of the tire.

[0004] In one aspect, the present application provides a design method of a light truck tire, comprising the following steps:

[0005] S1: collecting the use environment data of the light truck tire to generate the working parameter requirement of the light truck tire;

[0006] S2: generating the contour data of the light truck tire based on the working parameter requirement of the light truck tire;

[0007] S3: generating the size data and preliminary material selection of each part structure of the light truck tire based on the contour data of the light truck tire and the working parameter requirement of the light truck tire, wherein the structure of the light truck tire comprises a carcass, a belt layer, a tread, a triangular rubber strip and a sidewall;

[0008] S4: generating a preliminary model based on the contour data of the light truck tire, the size data of each part structure of the light truck tire and the preliminary material selection;

[0009] S5: performing simulation analysis on the preliminary model, adjusting the size data and material selection of each part structure of the light truck tire to obtain a production model;

[0010] S6: selecting a tread pattern based on the working parameter requirement of the light truck tire;

[0011] S7: generating a use air pressure range of the light truck tire based on the working parameter requirement of the light truck tire;

[0012] S8: adding the tread pattern and the use air pressure range of the light truck tire to the production model;

[0013] S9: producing a sample tire based on the production model, and verifying the design effect through field detection.

[0014] Preferably, step S5 comprises:

[0015] S51: Simulate the preliminary model to determine whether the preliminary model meets the working parameter requirements of the light truck tire, and if the preliminary model meets the working parameter requirements of the light truck tire, directly use the preliminary model as the to-be-determined model;

[0016] S52: If the preliminary model cannot meet the working parameter requirements of the light truck tire, adjust the size data and material selection of each part of the preliminary model to obtain a to-be-determined model;

[0017] S53: Material check the to-be-determined model, if the to-be-determined model passes the material check, output the to-be-determined model as a production model, if the to-be-determined model fails the material check, modify the part of the to-be-determined model that fails the material check and output the production model.

[0018] Preferably, step S52 comprises:

[0019] S521: Adjust the size of each part of the light truck tire to determine whether the working parameter requirements of the light truck tire are met, if the working parameter requirements of the light truck tire are met, do not adjust the material selection of each part of the light truck tire;

[0020] S522: If the working parameter requirements of the light truck tire cannot be met by adjusting only the size of each part of the light truck tire, do not adjust the size of each part of the light truck tire, and only adjust the material selection of each part of the light truck tire to determine whether the working parameter requirements of the light truck tire are met;

[0021] S523: If the working parameter requirements of the light truck tire cannot be met by adjusting only the material selection of each part of the light truck tire, redesign the size and material selection of each part of the light truck tire.

[0022] Preferably, the material check step comprises:

[0023] S531: Determine whether the material selection of the underlayer rubber of the belt and the main rubber of the sidewall is the same, if the same, do not pass the material check;

[0024] S532: Determine whether the material composition of the triangular rubber strip is equal to two, if the material composition of the triangular rubber strip is not two, do not pass the material check.

[0025] Preferably, it further comprises step S54: checking the size data of the triangular rubber strip, and step S54 comprises:

[0026] S541: Check the height of the triangular rubber strip;

[0027] ; wherein SH is the height of the light truck tire cross section; a is the cross-sectional height of the triangular rubber strip;

[0028] S542: verifying the compound form of the triangular strip;

[0029] ; wherein, is the cross-sectional height of the rubber body of the triangular strip close to the tire lip side.

[0030] Preferably, step S7 comprises:

[0031] S71: calculating the minimum working pressure of the light truck tire;

[0032] S72: calculating the maximum working pressure of the light truck tire;

[0033] S73: generating the use air pressure range of the light truck tire according to the minimum working pressure of the light truck tire and the maximum working pressure of the light truck tire.

[0034] Preferably, step S71 calculates the minimum working pressure of the light truck tire based on the following formula:

[0035] ; wherein, is the minimum working pressure of the light truck tire; is the maximum allowable driving speed of the vehicle; is the calculation reference value of the preset driving speed; is the safety factor of the load bearing capacity of the light truck tire; is the total weight of the vehicle body in the preset empty state of the vehicle; is the maximum load weight of the vehicle; N is the total number of light truck tires required to be loaded on the preset vehicle; g is the acceleration of gravity; B is the width of the light truck tire; F is the flat ratio of the light truck tire; ln is the logarithmic function with e as the base; e is the natural base; is the calculation reference value of the preset ambient temperature; is the minimum working allowable ambient temperature of the preset light truck tire; is the unit temperature.

[0036] Preferably, step S72 calculates the maximum working pressure of the light truck tire based on the following formula:

[0037] ; wherein, is the maximum working pressure of the light truck tire; ln is the logarithmic function with e as the base; e is the natural base; is the calculation reference value of the preset ambient temperature; is the minimum ambient temperature during the working of the preset light truck tire; is the unit temperature; is the minimum value of the tensile strength in the material of each part structure of the light truck tire; B is the width of the light truck tire; F is the flat ratio of the light truck tire; D is the diameter of the light truck tire; is the maximum allowable driving speed of the vehicle; is a calculation reference value of a preset driving speed; are respectively a weighted coefficient of the service life of the light truck tire and a driving mileage of the light truck tire; S is the service life of the light truck tire; is a grading reference value of the service life of the light truck tire; L is the driving mileage of the light truck tire; is a grading reference value of the driving mileage of the light truck tire; is a safety factor of the maximum working pressure of the light truck tire; is a unit area.

[0038] Compared with the prior art, the present application has the following beneficial effects:

[0039] Through the investigation of the use environment of the light truck tire, the working parameter demand of the light truck tire obtained is more in line with the actual use demand of the light truck tire, and through the comprehensive consideration of multiple factors such as the material, structure and pattern of the tire, and the mutual influence relationship between the structures, the comprehensive improvement of the performance of the tire is realized. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0041] Figure 1 is a design method flowchart of the present application. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme in the present application will be described clearly and completely in the following by combining the drawings in the present application. Obviously, the described embodiments are some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0043] In addition, the descriptions such as "first", "second" and the like in the present application are only for the purpose of description, and do not mean to particularly indicate the order or sequence, nor to limit the present application, which are merely to distinguish the components or operations described by the same technical terms, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features of various embodiments can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0044] Embodiment 1

[0045] The embodiment of the present application provides a design method of a light truck tire, comprising the following steps:

[0046] S1: collecting the use environment data of the light truck tire to generate the working parameter requirement of the light truck tire;

[0047] S2: generating the contour data of the light truck tire based on the working parameter requirement of the light truck tire;

[0048] S3: generating the size data and preliminary material selection of each part structure of the light truck tire based on the contour data of the light truck tire and the working parameter requirement of the light truck tire, the structure of the light truck tire comprising a carcass, a belt, a tread, a triangular rubber strip and a sidewall;

[0049] S4: generating a preliminary model based on the contour data of the light truck tire, the size data of each part structure of the light truck tire and the preliminary material selection;

[0050] S5: performing simulation analysis on the preliminary model, adjusting the size data and material selection of each part structure of the light truck tire to obtain a production model;

[0051] S6: selecting a tread pattern based on the working parameter requirement of the light truck tire;

[0052] S7: generating a use air pressure range of the light truck tire based on the working parameter requirement of the light truck tire;

[0053] S8: adding the tread pattern and the use air pressure range of the light truck tire to the production model;

[0054] S9: producing a sample tire based on the production model, and detecting and verifying the design effect on site.

[0055] Preferably, step S5 comprises:

[0056] S51: Simulate the preliminary model to determine whether the preliminary model meets the working parameter requirements of the light truck tire, and if the preliminary model meets the working parameter requirements of the light truck tire, the preliminary model is directly used as the to-be-determined model;

[0057] S52: If the preliminary model cannot meet the working parameter requirements of the light truck tire, adjust the size data and material selection of each part structure of the preliminary model to obtain a to-be-determined model;

[0058] S53: Material verification is performed on the to-be-determined model, and if the material verification of the to-be-determined model passes, the to-be-determined model is output as a production model, and if the material verification of the to-be-determined model fails, the part of the to-be-determined model that fails the material verification is modified and output as a production model.

[0059] In this embodiment, the use environment data of the light truck tire includes driving road conditions, load requirements, and vehicle driving speed range.

[0060] In this embodiment, the working parameter requirements include the structure of the light truck tire installation position, the support and load bearing performance of the light truck tire, the traction and braking performance of the light truck tire, the cushioning performance of the light truck tire, the wear resistance of the light truck tire, the environmental protection of the light truck tire, the maximum allowable driving speed of the light truck tire, and the allowable working environment temperature of the light truck tire.

[0061] In this embodiment, the profile data of the light truck tire includes tire width, flat ratio, and hub outer diameter.

[0062] In this embodiment, the size data of each part structure of the light truck tire is the cross-sectional shape of each part structure of the light truck tire.

[0063] The beneficial effects of the above technical solution are:

[0064] By investigating the use environment of the light truck tire, the working parameter requirements of the light truck tire obtained are more in line with the actual use requirements of the light truck tire. By comprehensively considering the material, structure, pattern, and other factors of the tire, and by comprehensively considering the mutual influence relationship between each part structure, the overall performance of the tire is improved. Specifically, the durability and wear resistance of the tire are improved, the service life of the tire is prolonged, the control performance and stability of the tire are optimized, and the driving safety of the vehicle is improved. The rolling resistance and noise level of the tire are reduced.

[0065] The preliminary model is generated by integrating the independent designs of the structures of the parts of the light truck tire, and the preliminary model is simulated to ensure the rationality of the overall structure of the tire in the theoretical design stage, avoid the situation that the parts of the tire cannot reach the expected performance indicators after being combined, cause the overall performance of the light truck tire to fail to meet the working parameter requirements of the light truck tire, and timely adjust in the theoretical design stage to reduce the cost and time of model verification and improve the efficiency of the design process of the light truck tire.

[0066] The to-be-determined model is obtained after the preliminary model is verified and modified in the static working performance, and the material of the to-be-determined model is checked to ensure that the material selection of the parts of the tire can meet the matching requirements of the material selection of different parts of the tire after being combined, so that the overall heat dissipation performance and mechanical transmission performance of the light truck tire meet the use requirements and reduce the probability of the problems of shoulder empty and tire lip bulging of the light truck tire.

[0067] Embodiment 2

[0068] On the basis of embodiment 1, step S52 comprises:

[0069] S521: adjusting the sizes of the parts of the light truck tire, and determining whether the working parameter requirements of the light truck tire are met; if the working parameter requirements of the light truck tire are met, the material selection of the parts of the light truck tire is not adjusted;

[0070] S522: if the working parameter requirements of the light truck tire cannot be met by only adjusting the sizes of the parts of the light truck tire, the sizes of the parts of the light truck tire are not adjusted, and only the material selection of the parts of the light truck tire is adjusted to determine whether the working parameter requirements of the light truck tire are met;

[0071] S523: if the working parameter requirements of the light truck tire cannot be met by only adjusting the material selection of the parts of the light truck tire, the sizes and the material selection of the parts of the light truck tire are re-designed.

[0072] The beneficial effects of the above technical solutions are:

[0073] When the preliminary model is adjusted, the sizes are adjusted, the material selection of the parts is adjusted, and the sizes and the material selection of the parts of the light truck tire are re-designed in sequence, so that the impact on the overall tire caused by the modification is minimized during the modification process, thereby reducing the occurrence of secondary problems and avoiding the increase of the engineering quantity in the design process of the light truck tire and affecting the efficiency of the design of the light truck tire.

[0074] Embodiment 3

[0075] On the basis of embodiment 1 or 2, the step of material checking comprises:

[0076] S531: Determine whether the material selection of the belt under-rubber and the main rubber of the sidewall is the same, if the same, then not pass the material check;

[0077] S532: Determine whether the material composition of the apex strip is equal to two, if the material composition of the apex strip is not two, then not pass the material check.

[0078] The beneficial effects of the above technical solutions are:

[0079] By adopting the design of three-composite sidewall and composite apex strip, the stress at the shoulder position and the bead position can be dispersed, and the risk of shoulder void and tire lip bulging can be reduced. The composite apex strip rubber can reduce heat concentration and ensure smooth transition of force, thereby improving the durability of the tire shoulder position and tire lip position under high load, improving the phenomenon of premature shoulder void and tire lip bulging, and improving driving safety.

[0080] Embodiment 4

[0081] On the basis of any one of embodiments 1-3, further comprising step S54: checking the size data of the apex strip, step S54 comprising:

[0082] S541: Checking the height of the apex strip;

[0083] ; wherein SH is the height of the light truck tire section; a is the cross-sectional height of the apex strip;

[0084] S542: Checking the composite form of the apex strip:

[0085] ; wherein, is the cross-sectional height of the rubber near the tire lip side of the apex strip.

[0086] The beneficial effects of the above technical solutions are:

[0087] By limiting the height and composite form of the apex strip, the lengthened design of the apex strip increases the stress transmission from the bead to the sidewall, and disperses the smooth transition of the stress at the bead position to the soft sidewall. The design of the composite form meets the needs of strengthening the rigid support of the bead and stress transmission, and improves the working performance of the light truck tire.

[0088] Embodiment 5

[0089] On the basis of any one of embodiments 1-4, step S7 comprises:

[0090] S71: Calculate the minimum working pressure of the light truck tire;

[0091] S72: Calculate the maximum working pressure of the light truck tire;

[0092] S73: generating a service pressure range of the light truck tire according to the minimum working pressure of the light truck tire and the maximum working pressure of the light truck tire.

[0093] Preferably, the step S71 calculates the minimum working pressure of the light truck tire based on the following formula:

[0094] ; wherein, is the minimum working pressure of the light truck tire; is the maximum allowable driving speed of the vehicle; is the calculation reference value of the preset driving speed; is the safety factor of the load bearing capacity of the light truck tire (the value is greater than 1); is the preset total weight of the vehicle body in the empty state of the vehicle; is the maximum load of the vehicle; N is the preset total number of the light truck tires required to be loaded on the vehicle; g is the acceleration of gravity; B is the width of the light truck tire; F is the flat ratio of the light truck tire; ln is the logarithmic function with e as the base; e is the natural base; is the calculation reference value of the preset ambient temperature; is the minimum working allowable ambient temperature of the light truck tire; is the unit temperature.

[0095] Preferably, the step S72 calculates the maximum working pressure of the light truck tire based on the following formula:

[0096] ; wherein, is the maximum working pressure of the light truck tire; ln is the logarithmic function with e as the base; e is the natural base; is the calculation reference value of the preset ambient temperature; is the minimum ambient temperature during the working of the light truck tire; is the unit temperature; is the minimum value of the tensile strength in the material of each part structure of the light truck tire; B is the width of the light truck tire; F is the flat ratio of the light truck tire; D is the diameter of the light truck tire; is the maximum allowable driving speed of the vehicle; is the calculation reference value of the preset driving speed; are respectively the weighting coefficients of the service life of the light truck tire and the mileage of the light truck tire; S is the service life of the light truck tire; is the classification reference value of the service life of the light truck tire; L is the mileage of the light truck tire; is the classification reference value of the mileage of the light truck tire; is the safety factor of the maximum working pressure of the light truck tire (the value is greater than 1); is the unit area.

[0097] In this embodiment, the calculation reference value of the driving speed is the vehicle driving speed in ideal experimental conditions, which is 60 km / h in this embodiment.

[0098] In this embodiment, the calculation reference value of the ambient temperature is the ambient temperature in standard environment, which is 23℃±1℃ in this embodiment.

[0099] The above technical solution has the following beneficial effects:

[0100] By calculating the minimum working pressure of the light truck tire, the excellent use performance of the light truck tire in use is ensured, by calculating the maximum working pressure of the light truck tire, the safety of the light truck tire in use is ensured, by obtaining the use air pressure range of the light truck tire and providing the use air pressure range of the light truck tire to the user, when the user detects the actual air pressure of the light truck tire in use, the user can quickly judge whether the actual air pressure of the light truck tire is within a reasonable range, and the safety and excellent working performance of the light truck tire in use are ensured.

[0101] When calculating the minimum working pressure of the light truck tire, the maximum load of the light truck tire is used as the basis The minimum working pressure of the light truck tire under ideal experimental conditions is calculated, and then the maximum allowable driving speed and the minimum use temperature required by the light truck tire are used to calculate and The minimum working pressure under ideal experimental conditions is corrected, so that the light truck tire can maintain excellent working performance within a reasonable working range.

[0102] When calculating the maximum working pressure of the light truck tire, the maximum allowable working pressure of the weakest position of the light truck tire under ideal experimental conditions is calculated The maximum allowable working pressure of the weakest position of the light truck tire under ideal experimental conditions is calculated, and then the maximum allowable working pressure of the weakest position of the light truck tire under actual working conditions is obtained by correcting and The maximum allowable working pressure under ideal experimental conditions is corrected, so that the maximum allowable working pressure of the weakest position of the light truck tire under actual working conditions is obtained, and the maximum allowable working pressure of the light truck tire under actual working conditions is used to represent the maximum allowable working pressure of the light truck tire as a whole under actual working conditions, so that the safety of the light truck tire in use is ensured. The maximum working pressure of the light truck tire is corrected according to the used years and the traveled mileage of the light truck tire, so that the highest working pressure of the light truck tire under different use degrees is obtained (in actual use, a plurality of representative used years and traveled mileage of the light truck tire are selected to calculate, so that the highest working pressure of the light truck tire corresponding to a plurality of used years and traveled mileage ranges of the light truck tire is obtained), so that the highest allowable working pressure of the light truck tire is estimated without detailed detection of the light truck tire, so that the user of the vehicle can conveniently understand the change of the highest allowable working pressure of the light truck tire, so that the hidden danger in the use of the light truck tire can be found in time, and the use safety of the light truck tire is further ensured.

[0103] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method of designing a light truck tire, characterized in that, Comprise the following steps: S1: Collecting the use environment data of the light truck tire, generating the working parameter demand of the light truck tire; S2: Generating the contour data of the light truck tire based on the working parameter demand of the light truck tire; S3: Generating the size data and preliminary material selection of each part structure of the light truck tire based on the contour data of the light truck tire and the working parameter demand of the light truck tire, the structure of the light truck tire comprising the carcass, the belt, the tread, the triangular strip and the sidewall; S4: Generating the preliminary model based on the contour data of the light truck tire, the size data of each part structure of the light truck tire and the preliminary material selection; S5: Simulating and analyzing the preliminary model, adjusting the size data and material selection of each part structure of the light truck tire to obtain the production model; S6: Selecting the tread pattern based on the working parameter demand of the light truck tire; S7: Generating the use air pressure range of the light truck tire based on the working parameter demand of the light truck tire; S8: Adding the tread pattern and the use air pressure range of the light truck tire to the production model; S9: Producing the sample tire based on the production model, and verifying the design effect through field detection; Step S5 comprises: S51: Simulating and analyzing the preliminary model to determine whether the preliminary model meets the working parameter demand of the light truck tire, if the preliminary model meets the working parameter demand of the light truck tire, then the preliminary model is directly used as the to-be-determined model; S52: If the preliminary model cannot meet the working parameter demand of the light truck tire, adjusting the size data and material selection of each part structure of the preliminary model to obtain the to-be-determined model; S53: Material checking of the to-be-determined model, if the material checking of the to-be-determined model passes, then the to-be-determined model is output as the production model, if the material checking of the to-be-determined model fails, then the part of the to-be-determined model which fails in the material checking is modified and output as the production model; Step S52 comprises: S521: Adjusting the size of each part structure of the light truck tire to determine whether the working parameter demand of the light truck tire is met, if the working parameter demand of the light truck tire is met, then the material selection of each part of the light truck tire is not adjusted; S522: If the working parameter demand of the light truck tire cannot be met by adjusting only the size of each part structure of the light truck tire, then the size of each part structure of the light truck tire is not adjusted, and only the material selection of each part of the light truck tire is adjusted to determine whether the working parameter demand of the light truck tire is met; S523: If the working parameter demand of the light truck tire cannot be met by adjusting only the material selection of each part of the light truck tire, then the size and material selection of each part of the light truck tire are redesigned; The step of material checking comprises: S531: Determining whether the material selection of the belt undercoat and the sidewall main rubber is the same, if the same, then the material checking fails; S532: Determining whether the material composition of the triangular strip is two, if the material composition of the triangular strip is not two, then the material checking fails; Further comprising step S54: verifying the size data of the triangular strip, and step S54 comprises: S541: Verifying the height of the triangular strip; ; where SH is the height of the light truck tire cross section; a is the cross section height of the triangular strip; S542: Verifying the compound form of the triangular strip; ; wherein a1 is the cross-sectional height of the rubber body of the triangular rubber strip near the bead lip side.

2. The method of designing a light truck tire according to claim 1, wherein Step S7 comprises: S71: Calculating the minimum working pressure of the light truck tire; S72: Calculating the maximum working pressure of the light truck tire; S73: generating a use air pressure range of the light truck tire based on the minimum working pressure of the light truck tire and the maximum working pressure of the light truck tire.

3. The method of designing a light truck tire according to claim 2, wherein Step S71 calculates the minimum working pressure of the light truck tire based on the following formula; ; wherein, P1 is the minimum working pressure of the light truck tire; V m is the maximum allowable driving speed of the vehicle; V b is the calculated reference value of the preset driving speed; σ is the safety factor of the load-bearing capacity of the light truck tire; G0 is the preset total weight of the vehicle body in the empty state; G z is the maximum load of the vehicle; N is the preset total number of light truck tires required to be loaded on the vehicle; g is the acceleration of gravity; B is the width of the light truck tire; F is the flat ratio of the light truck tire; ln is the logarithmic function with e as the base; e is the natural base; T b is the calculated reference value of the preset ambient temperature; T d is the minimum working allowable ambient temperature of the preset light truck tire; T0 is the unit temperature.

4. The method of designing a light truck tire according to Claim 2, wherein Step S72 calculates the maximum working pressure of the light truck tire based on the following formula; ; wherein P2 is the maximum working pressure of the light truck tire; ln is the logarithm function with e as the base; e is the natural base; T b is the calculated reference value of the preset ambient temperature; T d is the preset minimum ambient temperature when the light truck tire is working; T0 is the unit temperature; min(μ) is the minimum value of the tensile strength among the materials of the various parts of the light truck tire; B is the width of the light truck tire; F is the flat ratio of the light truck tire; D is the diameter of the light truck tire; V m is the maximum allowable driving speed of the vehicle; V b is the calculated reference value of the preset driving speed; α and β are the weighting coefficients of the service life of the light truck tire and the driving mileage of the light truck tire, respectively; S is the service life of the light truck tire; S0 is the grading reference value of the service life of the light truck tire; L is the driving mileage of the light truck tire; L0 is the grading reference value of the driving mileage of the light truck tire; τ is the safety factor of the maximum working pressure of the light truck tire; and A0 is the unit area.

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