Precise design method of tire shoulder pad and tire

Abstract

The application discloses a precise design method of tire shoulder pad rubber and a tire, and comprises the following steps: determining a measuring point X of the tire shoulder pad rubber on a tire design section; obtaining tire side semi-finished product size parameters, wherein the tire side semi-finished product size parameters comprise a tire side width W1B, a tire side setting line, and right-angled trapezoidal structure parameters H1, H2 and W1 of the tire side pad rubber; calculating a semi-finished product corresponding point thickness H3 according to the following mode: calculating a width position W2 of the measuring point X on the tire side semi-finished product; calculating the semi-finished product corresponding point thickness H3 according to a linear relationship between the right-angled trapezoidal height and the width; obtaining a cord rubber coating thickness H5, a belt layer rubber coating thickness H4, a cord elongation coefficient LC and a belt layer elongation coefficient LB; and calculating a tire shoulder pad rubber finished product thickness H at the measuring point X according to the following formula. The application realizes precise design of the tire shoulder pad rubber thickness, significantly improves tire shoulder stress distribution, improves tire durability, and effectively reduces product development cost.

Description

Technical Field

[0001] This invention relates to the field of tire design technology, and in particular to a precise design method for tire shoulder pad rubber and a tire. Background Technology

[0002] With the development of automobiles and highway transportation, tire performance requirements are constantly increasing, especially in terms of load performance, durability, and safety. Traditional tire shoulder pad structures have problems: the thickness of the tire shoulder pad is not precisely considered, making it difficult to adapt to the tread and belt layers, leading to stress concentration and easily causing tire shoulder delamination and belt layer tearing. In addition, under high load and high speed, the tire crown experiences great stress and heat generation, affecting tire life.

[0003] Several invention patents have been granted to address shoulder defects, such as belt layer delamination, during high-speed tire testing. For example: CN120680848A discloses a shoulder pad structure and tire for an all-steel radial tire. The pad width is 35%-45% of the tread width, with a central thickness of 6-8mm and an edge thickness of 2-3mm. The angle between the two side edges and the tread centerline is 15°-25°, and three positioning points are provided. This patent optimizes the pad's dimensional parameters and positioning method, combined with a gradual thickness design and specific material formulation, to ensure reduced deformation of the pad during tire molding. However, this patent still suffers from insufficient optimization of the pad's structural parameters, making it difficult to achieve better uniform stress distribution and stress dispersion.

[0004] The existing technology has the following drawbacks: Existing tire precision design methods do not simultaneously consider multiple factors such as the position and size of the tire shoulder pad rubber, the thickness of the ply rubber coating, and the thickness of the belt layer rubber coating, leading to shoulder defects such as belt layer delamination. During high-speed testing, due to unreasonable position and size of the tire shoulder pad rubber, it is difficult to achieve a good fit with the tread and belt layer, which can easily cause stress concentration, leading to failures such as tire shoulder delamination and belt layer end tearing. Summary of the Invention The purpose of this invention is to overcome the shortcomings of the existing technology. To achieve the above objective, a precise design method for tire shoulder pad rubber and a tire are adopted to solve the problems mentioned in the background art.

[0005] A precise design method for tire shoulder pad rubber, comprising the following steps: Step S1: Determine the measurement point X of the tire shoulder pad rubber on the tire design section; Step S2: Obtain the dimensional parameters of the semi-finished sidewall product. The dimensional parameters of the semi-finished sidewall product include the sidewall width W1B, the sidewall setting line, and the right-angled trapezoidal structure parameters H1, H2, and W1 of the sidewall pad rubber. Calculate the thickness H3 of the corresponding point of the semi-finished product according to the following method: Calculate the width position W2 of the measurement point X on the tire sidewall semi-finished product, where W2 = W1B - tire sidewall setting line - X; Based on the linear relationship between the height and width of the right trapezoid, the thickness H3 of the corresponding point of the semi-finished product is calculated using the formula H3 = H2+(H1-H2) / W1×(W1-W2). Step S3: Obtain the adhesive coating thickness H5 of the cord fabric, the adhesive coating thickness H4 of the belt layer, the elongation coefficient LC of the cord fabric, and the elongation coefficient LB of the belt layer; Step S4: Calculate the thickness H of the tire shoulder pad rubber at the measurement point X according to the following formula: H = (H3 + H5) / LC + H4 / LB.

[0006] As a further aspect of the present invention: the sidewall width W1B, the sidewall setting line, the heights H1 and H2 of the right trapezoid, and the width W1 are all preset values, determined according to the target tire specifications.

[0007] As a further aspect of the present invention: the adhesive coating thickness H5 of the ply fabric is the adhesive coating thickness on one side of the carcass ply fabric; the adhesive coating thickness H4 of the belt layer is the adhesive coating thickness on one side of the belt layer.

[0008] As a further aspect of the present invention: the elongation coefficient LC of the ply and the elongation coefficient LB of the belt layer are predetermined based on the tire manufacturing process and material properties.

[0009] As a further aspect of the present invention: the parameters in the dimensions of the tire sidewall semi-finished product are selected from any combination of the following: H1 is 0.5mm; H2 ranges from 2.8 mm to 4.5 mm; W1 is 15mm or 20mm; W1B is 84mm to 108mm; The sidewall setting line is 75mm to 103mm; The measurement point X is 2mm or 4mm.

[0010] As a further aspect of the present invention, it also includes step S5: the tire is prototyped according to the calculated thickness H, and the finished tire is sliced ​​and measured at the measurement point X. If the error between the measured thickness and H exceeds the preset range, the parameters of the right trapezoidal structure or the material elongation coefficient are adjusted, and steps S2 to S4 are repeated.

[0011] As a further aspect of the present invention, the preset range is ±0.02mm.

[0012] The second aspect of the technical solution is: a tire, wherein the tire shoulder pad rubber is designed using the design method described in any one of the above descriptions.

[0013] As a further aspect of the present invention: on the cross-section of the finished tire, the error between the actual thickness of the tire shoulder pad rubber at measurement point X and the thickness H calculated by any of the methods described above is within a preset range.

[0014] As a further aspect of the present invention, the preset range is ±0.02mm.

[0015] Compared with the prior art, the present invention has the following technical advantages: By adopting the above technical solution and introducing semi-finished product parameters and material elongation coefficients, a thickness conversion relationship from semi-finished product to finished product was established, enabling precise design of the tire shoulder pad thickness. Experimental verification shows that tires designed using this method have a finished tire shoulder pad thickness with an error of within ±0.02mm compared to the design value. Stress concentration in the tire shoulder area is reduced by approximately 17%, belt layer end-point temperature decreases by more than 15%, and high-speed durability life is increased by more than 25%. This effectively solves the problems of belt layer delamination and stress concentration caused by unreasonable tire shoulder pad dimensions, while also reducing the number of trial production runs and lowering product development costs. Attached Figure Description

[0016] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings: Figure 1 This is a schematic diagram illustrating the steps of an embodiment disclosed in this application; Figure 2 This is a schematic diagram of the structure of the tire shoulder pad rubber on the cross-section of the finished tire according to an embodiment of this application; Figure 3 This is a schematic diagram showing the dimensions of the tire sidewall semi-finished product according to an embodiment of this application; Figure 4 This is a schematic diagram showing the adhesive thickness of the belt layer in an embodiment disclosed in this application; Figure 5 This is a schematic diagram of the adhesive coating thickness of the fabric in an embodiment of this application. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1 refer to Figure 1 and Figure 2This embodiment provides a precise design method for tire shoulder pad rubber. The method is used to determine the thickness of the tire shoulder pad rubber on the cross-section of the finished tire so that it can be well adapted to the tread and belt layer, thereby improving stress distribution and enhancing tire durability.

[0019] Step S1: Determine the measurement point X of the tire shoulder pad rubber on the tire design section; First, on the tire's design cross-sectional drawing, determine the measurement point X for the tire shoulder pad rubber. Measurement point X is located in the tire shoulder area, specifically at a critical location on the tire shoulder pad rubber where precise thickness control is required. In this embodiment, the value of measurement point X can be pre-selected based on tire specifications and design experience; for example, X can be a value between 2mm and 4mm, preferably 2mm.

[0020] Step S2, as follows Figure 3 The diagram shows a schematic of the dimensions of the semi-finished tire sidewall. The dimensions of the semi-finished tire sidewall are obtained, including the sidewall width W1B, the sidewall setting line, and the right-angled trapezoidal structure parameters H1, H2, and W1 of the sidewall pad. The thickness H3 of the corresponding point of the semi-finished product is calculated according to the following method: Calculate the width position W2 of the measurement point X on the tire sidewall semi-finished product, where W2 = W1B - tire sidewall setting line - X; Based on the linear relationship between the height and width of the right trapezoid, the thickness H3 of the corresponding point of the semi-finished product is calculated using the formula H3 = H2+(H1-H2) / W1×(W1-W2). Obtain the semi-finished product parameters related to the tire carcass ply, including the thickness H3 at the corresponding point of the semi-finished product and the rubber coating thickness H5. The thickness H3 refers to the rubber thickness at the position corresponding to the finished product measurement point X in the semi-finished tire state. The rubber coating thickness H5 refers to the single-sided rubber coating thickness of the tire carcass ply. In this embodiment, H3 and H5 can be obtained by measuring the semi-finished tire or through material simulation analysis. For example, H3 can be a value within the range of 1.0 mm to 2.5 mm, and H5 can be a value within the range of 0.1 mm to 0.3 mm.

[0021] Obtain the semi-finished product parameters related to the belt layer, namely the belt layer adhesive thickness H4. For example... Figure 4 The diagram illustrates the thickness of the belt layer adhesive coating; the belt layer adhesive coating thickness H4 refers to the thickness of the adhesive coating on one side of the belt layer. In this embodiment, H4 can be obtained by measuring the semi-finished tire or through material simulation analysis; for example, H4 can be a value within the range of 0.1 mm to 0.4 mm.

[0022] The elongation coefficients of the materials are obtained, including the ply elongation coefficient LC and the belt elongation coefficient LB. The ply elongation coefficient LC and the belt elongation coefficient LB reflect the tensile deformation characteristics of the ply and belt materials during tire vulcanization. Their values ​​depend on the material formulation and process conditions and can be pre-determined based on process experience or experiments. For example, LC can be a value within the range of 1.20 to 1.50, and LB can be a value within the range of 1.01 to 1.05.

[0023] Step S3: Obtain the adhesive coating thickness H5 of the fabric, the adhesive coating thickness H4 of the belt layer, the elongation coefficient LC of the fabric, and the elongation coefficient LB of the belt layer; as follows Figure 5 As shown in the figure, it is a schematic diagram of the thickness of the adhesive coating on the curtain fabric; Step S4: Calculate the thickness H of the tire shoulder pad rubber at the measurement point X according to the following formula: H = (H3 + H5) / LC + H4 / LB; Let's illustrate this with a set of exemplary parameters: Assume the thickness of the semi-finished product at the corresponding point is H3 = 1.5 mm, the adhesive coating thickness of the fabric is H5 = 0.2 mm, the fabric elongation coefficient is LC = 1.45, the adhesive coating thickness of the belt layer is H4 = 0.235 mm, and the belt layer elongation coefficient is LB = 1.03. Substituting these parameters into the formula, we get: H = (1.5 + 0.2) / 1.45 + 0.235 / 1.03 H = 1.7 / 1.45 + 0.235 / 1.03 H ≈ 1.172 + 0.228 H ≈ 1.40 mm The calculation result is the designed thickness of the tire shoulder pad rubber at the measurement point X.

[0024] In this embodiment, the thickness H3 of the corresponding point of the semi-finished product is determined according to the size of the semi-finished product on the tire sidewall.

[0025] In this embodiment, the dimensions of the semi-finished sidewall product include the right-angled trapezoidal structural parameters of the sidewall pad rubber, and H3 is calculated in the following way: Determine the width position W2 of the measurement point X on the tire sidewall semi-finished product, where W2 = W1B - tire sidewall setting line - X; Based on the linear relationship between the height and width of a right trapezoid, the formula H3 = H2 + (H1 - H2) / W1 is used. Calculate H3 using (W1-W2); Wherein, W1B is the tire sidewall width, H1 and H2 are the height parameters of the right trapezoid, W1 is the width of the right trapezoid, and the tire sidewall setting line is the preset baseline.

[0026] In this embodiment, the tire sidewall width W1B, tire sidewall setting line, right-angled trapezoid height H1, H2 and width W1 are all preset values, determined according to the target tire specifications.

[0027] In this embodiment, the adhesive coating thickness H5 of the ply fabric is the adhesive coating thickness on one side of the tire carcass ply fabric; the adhesive coating thickness H4 of the belt layer is the adhesive coating thickness on one side of the belt layer.

[0028] In this embodiment, the elongation coefficient LC of the ply fabric and the elongation coefficient LB of the belt layer are predetermined based on the tire manufacturing process and material properties.

[0029] In this embodiment, the parameters in the dimensions of the semi-finished tire sidewall are selected from any combination of the following: H1 is 0.5mm; H2 ranges from 2.8 mm to 4.5 mm; W1 is 15mm or 20mm; W1B is 84mm to 108mm; The sidewall setting line is 75mm to 103mm; The measurement point X is 2mm or 4mm.

[0030] Comparative Example 1 To verify the inventiveness of the technical solution of the present invention, comparative example 1 is set up, which adopts the closest existing technical solution.

[0031] Structural description Specifically, the tire shoulder pad structure of Comparative Example 1 includes the following features: the pad width is 35%-45% of the tread width; the thickness of the pad in the middle is 6-8mm, and the thickness of the edge is 2-3mm; the angle between the two edges of the pad and the center line of the tread is 15°-25°; the pad has three positioning points; the pad adopts a gradient thickness design, combined with a specific material formula, to ensure that the pad reduces deformation during the tire forming process.

[0032] The difference between Comparative Example 1 and Embodiment 1 of the present invention is that the thickness of the tire shoulder pad rubber in Comparative Example 1 is directly set based on an empirical range (6-8 mm thick in the middle and 2-3 mm thick at the edges), without considering the fluidity and tensile deformation of the rubber material during the transformation from semi-finished product to finished product, and without establishing a quantitative relationship between semi-finished product parameters (such as the thickness H3 at the corresponding point of the semi-finished product, the rubber coating thickness H5 of the cord fabric, and the rubber coating thickness H4 of the belt layer) and the finished product thickness H. In short, Comparative Example 1 lacks the technical feature of the present invention of "calculating the finished thickness H of the tire shoulder pad rubber based on the semi-finished product parameters and the material elongation coefficient".

[0033] Due to the lack of the aforementioned distinguishing features, Comparative Example 1 could not accurately verify the thickness of the tire shoulder pad rubber during the design process, taking into account specific material properties and process conditions. Therefore, when this design was applied to tires of different specifications or under different process conditions, the actual finished thickness of the tire shoulder pad rubber often deviated from the design target, resulting in poor compatibility with the tread and belt layers, and a tendency to cause stress concentration in the shoulder area.

[0034] Comparative experiment To objectively compare the technical effects of Embodiment 1 and Comparative Example 1 of the present invention, the following comparative experiment was conducted. The experiment used 205 / 50R18 semi-steel radial tires of the same specification as the carrier. Except for the different design method of the tire shoulder pad rubber, the tire's other structures and material formulations were completely identical.

[0035] Experimental conditions: Tire specifications: 205 / 50R18 Test conditions: Ambient temperature 38℃±2℃, load rate 100%, speed 160km / h Sample quantity: 3 tires per group Measurement indicators: (1) Stress distribution in the tire shoulder area (measured using a patch pressure sensor). (2) Temperature at the end of the belt layer (monitored using an infrared thermal imager); (3) Passing time of high-speed durability test; (4) After the experiment, the shoulder was dissected and observed to determine the degree of delamination.

[0036] Example 2 This embodiment, based on embodiment 1, further describes in detail the specific method for determining the thickness H3 of the corresponding point of the semi-finished product.

[0037] Step 1: Determine the location of the measurement point First, the measurement point X of the tire shoulder pad rubber is determined on the tire design cross-section. The measurement point X is located in the tire shoulder area, and in this embodiment, X = 2mm.

[0038] Step 2: Obtain the dimensional parameters of the semi-finished tire sidewall Obtain the dimensional parameters of the semi-finished tire sidewall section, including: Sidewall width W1B: refers to the total width of the semi-finished sidewall product. In this embodiment, W1B = 84mm. Sidewall setting line: This is a preset baseline used to locate the relative position of the sidewall and the shoulder. In this embodiment, the sidewall setting line is 77mm. The right-angled trapezoidal structure parameters of the tire sidewall pad include height H1, H2, and width W1. H1 is the thickness at the top edge of the right-angled trapezoid (i.e., the edge thickness of the tire sidewall pad), H2 is the thickness at the bottom edge of the right-angled trapezoid (i.e., the center thickness of the tire sidewall pad), and W1 is the width of the right-angled trapezoid. In this embodiment, H1 = 0.5 mm, H2 = 3.5 mm, and W1 = 15 mm.

[0039] The above-mentioned sidewall semi-finished product size parameters can be preset according to the target tire specifications, and their values ​​are derived from the tire structure design drawings or the actual measured values ​​of the semi-finished components.

[0040] Step 3: Calculate the width position W2 corresponding to measurement point X on the tire sidewall semi-finished product. Calculate the width position W2 of measurement point X on the tire sidewall semi-finished product using the following formula: W2 = W1B - Sidewall Setting Line - X Substituting the parameters into this embodiment: W2 = 84 - 77 - 2 = 5mm.

[0041] Step 4: Calculate the thickness H3 of the corresponding point of the semi-finished product. Based on the linear relationship between the height and width of a right trapezoid, calculate H3 using the following formula: H3 = H2 + (H1 - H2) / W1 × (W1 - W2) The geometric meaning of this formula is: within a right trapezoid, the thickness at any width position is linearly related to the distance from that position to the two ends of the trapezoid.

[0042] Substitute the parameters into this embodiment: H3 = 3.5 + (0.5 - 3.5) / 15 × (15 - 5) H3 = 3.5 + (-3) / 15 × 10 H3 = 3.5 - 2.0 = 1.5mm Step 5: Obtain other parameters and calculate the finished thickness H of the tire shoulder pad adhesive. Following the same method as in Example 1, the adhesive coating thickness of the fabric was obtained as H5=0.2mm, the adhesive coating thickness of the belt layer was obtained as H4=0.235mm, the elongation coefficient of the fabric was obtained as LC=1.45, and the elongation coefficient of the belt layer was obtained as LB=1.03.

[0043] Substitute into the core formula to calculate H: H = (H3 + H5) / LC + H4 / LB H = (1.5 + 0.2) / 1.45 + 0.235 / 1.03 H = 1.7 / 1.45 + 0.235 / 1.03 H ≈ 1.172 + 0.228 = 1.40mm Step 6: Verify Results Tire prototypes were manufactured according to the above design parameters. A slice of the finished tire was measured at measurement point X, and the actual shoulder pad rubber thickness was found to be 1.40 mm, which is basically consistent with the calculated value (error within 0.01 mm). This indicates that the H3 calculation method provided in this embodiment can accurately convert the dimensions of the semi-finished tire sidewall into the corresponding thickness of the semi-finished product, thereby achieving precise design of the shoulder pad rubber thickness.

[0044] Example 3 This embodiment, based on Embodiment 2, demonstrates the calculation results under different combinations of tire sidewall semi-finished product size parameters, to prove the universality and stability of the method of the present invention.

[0045] Five different combinations of sidewall semi-finished product size parameters were selected, and the H3 value and the final thickness H of the tire shoulder pad rubber were calculated for each combination according to the steps described in Example 2. The results were then compared with the measured values ​​of the actual prototype tires. The parameters and calculation results for each combination are shown in Table 2.

[0046] Table 2 Comparison of calculation results and actual measured values ​​under different parameter combinations

[0047] As can be seen from the data in Table 2, under five different combinations of sidewall semi-finished product size parameters, the error between the finished thickness H of the tire shoulder pad rubber calculated by the method of this invention and the measured thickness H' of the actual prototype tire does not exceed 0.01 mm. This result fully demonstrates that: (1) This method is applicable to the design of various tires of different specifications and has good universality; (2) This method has high calculation accuracy and can meet the requirements of engineering applications; (3) The parameter ranges listed in claim 7 (H1=0.5mm, H2=2.8-4.5mm, W1=15mm or 20mm, W1B=84-108mm, sidewall setting line=75-103mm, X=2mm or 4mm) are all supported by experimental data.

[0048] Example 4 This embodiment applies the design method from Embodiment 3 to the manufacture of 205 / 50R18 semi-steel radial tires, and performs slice measurements and performance verification on the finished tires.

[0049] Design Input Select the combined parameter 1 from Example 3 as the design input: Sidewall width W1B = 78mm Sidewall setting line = 70mm Measurement point X = 2mm Parameters of the right-angled trapezoidal sidewall gasket: H1 = 0.5mm, H2 = 3.2mm, W1 = 14mm The thickness of the adhesive coating on the curtain fabric, H5, is 0.22mm. The thickness of the adhesive coating on the belt layer is H4 = 0.25mm. The elongation coefficient of the fabric is LC = 1.42 The stretching coefficient of the belt layer is LB = 1.031 Following the calculation steps of Example 2, the designed thickness H of the tire shoulder pad rubber at measurement point X was found to be 1.38 mm.

[0050] The second aspect of the technical solution is: a tire, characterized in that the tire shoulder pad rubber is designed using the design method described in any one of the above descriptions.

[0051] Specifically, on the cross-section of the finished tire, the error between the actual thickness of the tire shoulder pad rubber at measurement point X and the thickness H calculated by any of the methods described above is within a preset range.

[0052] Specifically, the preset range is ±0.02mm.

[0053] In summary, this embodiment demonstrates that the tire designed and manufactured using the method of the present invention has a finished tire shoulder pad rubber thickness error that can be controlled within ±0.02mm, and the overall tire performance is significantly improved.

[0054] Technical effect verification To verify the effectiveness of the method in this embodiment, the calculated thickness H=1.40mm was used as the design target for tire trial production. The trial tire was sliced ​​and measured at the corresponding measurement point X, and the actual shoulder pad thickness was found to be 1.40mm, completely consistent with the calculated value. Indoor high-speed durability tests were conducted on this tire and a tire designed using traditional empirical methods. The results showed that the tire designed using the method in this embodiment exhibited a more uniform stress distribution in the shoulder area, with the maximum stress at the belt layer endpoint reduced by approximately 15%. No belt layer delamination or shoulder delamination occurred during the high-speed durability test, significantly improving tire lifespan. This demonstrates that the method described in this embodiment can achieve precise design of the shoulder pad thickness, effectively solving the shoulder stress concentration problem caused by unreasonable shoulder pad dimensions in existing technologies.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention. The scope of the invention is defined by the appended claims and their equivalents, all of which should be included within the scope of protection of the invention.

Claims

1. A precise design method for tire shoulder pad rubber, characterized in that, Includes the following steps: Step S1: Determine the measurement point X of the tire shoulder pad rubber on the tire design section; Step S2: Obtain the dimensional parameters of the semi-finished sidewall product. The dimensional parameters of the semi-finished sidewall product include the sidewall width W1B, the sidewall setting line, and the right-angled trapezoidal structure parameters H1, H2, and W1 of the sidewall pad rubber. Calculate the thickness H3 of the corresponding point of the semi-finished product according to the following method: Calculate the width position W2 of the measurement point X on the tire sidewall semi-finished product, where W2 = W1B - tire sidewall setting line - X; Based on the linear relationship between the height and width of the right trapezoid, the thickness H3 of the corresponding point of the semi-finished product is calculated using the formula H3 = H2+(H1-H2) / W1×(W1-W2). Step S3: Obtain the adhesive coating thickness H5 of the cord fabric, the adhesive coating thickness H4 of the belt layer, the elongation coefficient LC of the cord fabric, and the elongation coefficient LB of the belt layer; Step S4: Calculate the thickness H of the tire shoulder pad rubber at the measurement point X according to the following formula: H = (H3 + H5) / LC + H4 / LB.

2. The design method of claim 1, wherein The sidewall width W1B, sidewall setting line, right-angled trapezoid height H1, H2, and width W1 are all preset values, determined according to the target tire specifications.

3. The method of claim 1, wherein, The adhesive coating thickness H5 of the tire cord is the adhesive coating thickness on one side of the tire cord; the adhesive coating thickness H4 of the belt layer is the adhesive coating thickness on one side of the belt layer.

4. The method of claim 1, wherein The elongation coefficient LC of the ply and the elongation coefficient LB of the belt layer are determined in advance based on the tire manufacturing process and material properties.

5. The method of claim 1, wherein, The parameters in the dimensions of the semi-finished tire sidewall are selected from any combination of the following: H1 is 0.5mm; H2 ranges from 2.8 mm to 4.5 mm; W1 is 15mm or 20mm; W1B is 84mm to 108mm; The sidewall setting line is 75mm to 103mm; The measurement point X is 2mm or 4mm.

6. The method of claim 1, wherein, It also includes step S5: to test the tire according to the calculated thickness H, to perform a slice measurement on the finished tire at the measurement point X, and if the error between the measured thickness and H exceeds the preset range, to adjust the parameters of the right trapezoidal structure or the material elongation coefficient, and to repeat steps S2 to S4.

7. The method of designing according to claim 6, wherein, The preset range is ±0.02mm.

8. A tire characterized by The tire shoulder pad rubber is designed using the design method described in any one of claims 1 to 7.

9. Tyre according to Claim 8, characterized in that, On the cross-section of the finished tire, the error between the actual thickness of the tire shoulder pad rubber at measurement point X and the thickness H calculated by the method described in any one of claims 1 to 8 is within a preset range.

10. Tyre according to Claim 9, characterized in that, The preset range is ±0.02mm.

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