Optimization design method for improving high-speed performance of tire

Abstract

The invention discloses an optimization design method for improving the high-speed performance of a tire. The method comprises the following steps: judging whether the evaluation characteristic of the high-speed performance of the current tire meets the high-speed performance design requirement or not; if the requirements are met, tire damage factors under current tire high-speed running are analyzed; according to the obtained tire damage factors, performing tire high-speed performance optimization to form a design optimization scheme, and obtaining a tire meeting the high-speed performance design requirement; and formulating a test scheme, verifying the effectiveness of the design optimization scheme, and performing optimization adjustment on the design optimization scheme according to a test result until a high-speed performance requirement is met, thereby obtaining an optimal design optimization scheme. The method analyzes the damage mechanism of the lower sidewall during the high-speed test of the tire, provides an optimization scheme of the high-speed performance of the tire with the decorative block on the lower sidewall, realizes prevention of high-speed risks during the initial design of the tire, reduces the occurrence rate of the high-speed problem of the tire, reduces the trial times in the tire performance verification stage, and improves the test efficiency. And the development period and cost are shortened.

Description

Technical Field

[0001] The invention relates to the technical field of tire design, and in particular to an optimization design method for improving high-speed performance of a tire. Background Art

[0002] During the operation of the tire, in addition to the radial, circumferential, and lateral stresses and strains on the lower sidewall caused by loading, for tires with decorative blocks or rim protection on the lower sidewall, when the designed lower sidewall size or material produces a large local inertia difference during the operation of the tire, a large torque will be generated at the raised position and its edge product. As the tire continues to run at high speed, the existence of this torque will gradually separate the carcass inside the wire ring from the material bonded outside the wire ring, resulting in bulging, cracks, falling blocks and other damage during high-speed operation.

[0003] Tires are irregular annular entities with irregular sizes and different material densities around the circumference. There are differences in their running inertia, which generates torque. When this torque difference reaches a certain level, the rubber material on the lower sidewall or the turned-up carcass will peel off when the tire test fails to meet the standard requirements. In order to eliminate the high-speed tire problems or risks caused by the difference in inertia between the parts of the tire, the difference in inertia between the lower sidewall of the tire and the upper part is reduced from a physical mechanism perspective, which reduces the torque and thus improves the high-speed performance of the tire.

[0004] For a particle, the moment of inertia I = mr∧2 (where M is its mass and r is the vertical distance between the particle and the axis of rotation), and the inertia of the object I = ∫r∧2dm. When the object is of regular shape, the inertia of the local position changes with the distance r from the axis of rotation, and is proportional to r∧2; when the object is of irregular shape, or there is a difference in the density of the local material, and the local inertia radius is different, such as the above-mentioned shape in this case: the local material density is different, the shape is not standardized, the local rigid body is in operation, and the other local elastic body, and the inertia difference between the elastic bodies is large; this inertia difference between adjacent positions causes torque to be generated. When the tire runs at high speed, this torque gradually peels the non-rigid part of the material from the rigid material, and the two points with the largest inertia difference are separated first, and the lower sidewall begins to bulge. If the operation continues, cracks or pieces will fall off until the tire fails.

[0005] In the current tire development process, the profile, structure, and material design are carried out according to the requirements of product profile, appearance, customers, and regulations. Because the phenomenon of damage to the lower sidewall during high-speed testing will not occur in tire products without special designs for the lower sidewall, it is easily overlooked. These high-speed test requirements are national standards, American standards, and other regulatory requirements. If the high-speed test fails, the tire will not meet the conditions for sale in the market.

[0006] The defects of the prior art are:

[0007] When there are no manufacturing problems, tire performance is directly related to design. When the tire mold, structure, material, and size are designed and the tire is ready for production, a solution is sought after a problem occurs. This solution is adopted after the prototype is completed and the problem is verified through testing. A different solution is adopted to re-produce the prototype. This process results in increased development costs, extended cycles, and customer complaints. Summary of the invention

[0008] The purpose of the present invention is to overcome the shortcomings of the prior art. To achieve the above purpose, an optimization design method for improving the high-speed performance of a tire is adopted to solve the problems raised in the above background technology.

[0009] An optimization design method for improving high-speed performance of a tire comprises the following steps:

[0010] Step S1, judging whether the evaluation characteristics of the current tire high-speed performance meet the high-speed performance design requirements;

[0011] Step S2: If the requirements are met, then analyze the tire damage factors under the current high-speed operation of the tire;

[0012] Step S3, optimizing the high-speed performance of the tire according to the obtained tire damage factors, forming a design optimization scheme, and obtaining a tire that meets the high-speed performance design requirements;

[0013] Step S4: formulate a test plan to verify the effectiveness of the design optimization plan, and optimize and adjust the design optimization plan according to the test results until the high-speed performance requirements are met and the optimal design optimization plan is obtained.

[0014] As a further solution of the present invention: the specific steps in step S1 include:

[0015] The tire comprises an upper sidewall, a lower sidewall, and a decorative block;

[0016] Determine whether the current tire high-speed performance evaluation characteristics meet the high-speed performance design requirements, including:

[0017] When the thickness difference between the decorative block and the adjacent upper or lower sidewall material is ≥2mm, and the local thickness difference is too narrow and the range is ≤10mm, the high-speed performance design of the tire is evaluated to assess whether it meets the high-speed performance design requirements.

[0018] As a further solution of the present invention: the specific steps in step S2 include:

[0019] Tire high-speed performance requirements, including:

[0020] When the tire is running, the tire carcass cord and wire ring are rigid materials, and the rubber parts are elastic materials, which causes a difference in rotational inertia between parts; and the different densities of the materials increase the difference in inertia between parts;

[0021] Under specific environmental conditions, load the required load, start running at a specific starting speed, and gradually increase the speed after running for the required time until the tire runs to the test standard corresponding to the speed level;

[0022] If the tire is not damaged, it passes the high-speed performance test requirements.

[0023] As a further solution of the present invention: the specific steps in step S3 include:

[0024] The design optimization scheme includes:

[0025] By reducing the thickness difference between the lower sidewall decoration and the non-rigid material of the bead area, the torque difference is reduced and the high-speed performance is improved;

[0026] Changing the size of the wear-resistant rubber, enhancing the integrity of the wear-resistant rubber and the sidewall rubber, extending the torque sharing range, reducing local torque, and enhancing the high-speed performance of the tire;

[0027] Among them, the section height range is SH>102mm, CH≥2.0mm;

[0028] The design range of wear-resistant rubber height is: D>A+b / 2;

[0029] Among them, SH is the cross-sectional height of the tire, C is the rubber thickness from the decorative block to the thickest position, H is the rubber thickness at the lower end point of the decorative block, A is the distance from the tire heel to the thickest position of the decorative block, D is the height of the wear-resistant rubber, a is the distance from the thickest position of the decorative block to the upper end point of the decorative block, and b is the distance from the thickest position of the decorative block to the lower end point of the decorative block.

[0030] As a further solution of the present invention: the specific steps in step S4 include:

[0031] Develop a detailed test plan, including test conditions, test methods, and test standards, to evaluate the performance of tires at high speeds;

[0032] Conduct tests according to the test plan, record and analyze the test results, and optimize and adjust the design based on the test results until the high-speed performance requirements are met.

[0033] Compared with the prior art, the present invention has the following technical effects:

[0034] By adopting the above technical solution, by analyzing the damage mechanism of the lower sidewall during high-speed tire testing, an optimization solution for the high-speed performance of the tire with lower tire belt decoration is provided. This design reduces the risk of high-speed damage to the lower sidewall of the tire due to inertia difference by reducing the local inertia of the lower sidewall of the tire, or balancing the inertia difference of the lower sidewall. In the initial design of the tire, high-speed risks are prevented to reduce the incidence of high-speed tire problems caused by them, reduce the number of trials in the tire performance verification stage, and shorten the development cycle and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings:

[0036] Figure 1 A schematic diagram of the steps of the optimization design method of the embodiment disclosed in this application;

[0037] Figure 2 A schematic diagram of partial materials of a tire according to an embodiment disclosed in the present application;

[0038] Figure 3 A schematic diagram of a decorative block according to an embodiment disclosed in the present application;

[0039] Figure 4 It is a schematic diagram of the dimensional design requirements for the high-speed performance of the lower sidewall of the embodiment disclosed in the present application. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Please refer to Figure 1 In an embodiment of the present invention, an optimization design method for improving high-speed performance of a tire comprises the following steps:

[0042] Step S1, judging whether the evaluation characteristics of the current tire high-speed performance meet the high-speed performance design requirements, the specific steps include:

[0043] The tire includes an upper sidewall, a lower sidewall, and a decorative block;

[0044] Determine whether the current tire high-speed performance evaluation characteristics meet the high-speed performance design requirements, including:

[0045] When the thickness difference between the decorative block and the adjacent upper or lower sidewall material is ≥2mm, and the local thickness difference is too narrow and the range is ≤10mm, the high-speed performance design of the tire is evaluated to assess whether it meets the high-speed performance design requirements.

[0046] In this embodiment, for a special tire with a decorative block design on the lower sidewall, when the thickness difference between the decorative block and the upper or lower sidewall material at the adjacent position is ≥2mm, and the local thickness difference is too narrow to be ≤10mm, it is necessary to evaluate the high-speed performance design of the tire;

[0047] Step S2: If the requirements are met, then analyze the tire damage factors under the current high-speed operation of the tire. The specific steps include:

[0048] In this embodiment, the tire can be regarded as a quasi-ring-shaped entity, and the local material, density, and size are uneven.

[0049] For tires of the same speed level, the high-speed performance requirements of the tires are the same. The high-speed performance requirements of tires include:

[0050] When the tire is running, the tire carcass cord and wire ring are rigid materials, and the rubber parts are elastic materials, which causes a difference in rotational inertia between parts; and the different densities of the materials increase the difference in inertia between parts;

[0051] Under specific environmental conditions, load the required load, start running at a specific starting speed, and gradually increase the speed after running for the required time until the tire runs to the test standard corresponding to the speed level;

[0052] If the tire is not damaged, it passes the high-speed performance test requirements.

[0053] like Figure 2 As shown, the figure is a schematic diagram of local materials of a tire;

[0054] like Figure 3 As shown, the figure is a schematic diagram of a decorative block;

[0055] When the tire is running at high speed, the direction of each particle changes all the time, and as the speed increases, the rate of change of the particle movement direction increases, causing the torque brought by the local moment of inertia to increase; at the same time, as the speed gradually increases, the temperature of the tire also gradually increases. The material thickness of the decorative block is thicker than its surroundings, and the temperature rises faster. The existence of torque and the high temperature state accelerate the peeling between the rigid body and the elastic body.

[0056] Step S3: optimizing the high-speed performance of the tire according to the obtained tire damage factors, forming a design optimization scheme, and obtaining a tire that meets the high-speed performance design requirements. The specific steps include:

[0057] In this embodiment, in order to reduce the inertia difference during tire operation and thus reduce the torque, design optimization is performed from the perspectives of material thickness difference and the integrity of local materials.

[0058] Reduce the torque difference between the lower sidewall and the bead area;

[0059] Specifically, the design optimization solution includes:

[0060] The reason for the torque difference on the lower sidewall is the difference in thickness between the non-rigid material at the lower sidewall decoration position and the non-rigid material at the tire bead position.

[0061] Solution 1: Reduce the thickness difference between the lower sidewall decorative block and the non-rigid material at the tire bead to reduce the torque difference and improve high-speed performance;

[0062] Solution 2: Change the size of the wear-resistant rubber, enhance the integrity of the wear-resistant rubber and the sidewall rubber, extend the torque sharing range, reduce local torque, and enhance the high-speed performance of the tire;

[0063] like Figure 4 As shown, the figure is a schematic diagram of the dimensional design requirements for the high-speed performance of the lower sidewall;

[0064] Among them, the applicable conditions are: the section height range is SH>102mm, CH≥2.0mm;

[0065] When the above applicable conditions are met, such as decorative effect, tire wind resistance, etc., and the size meets the above conditions when designing the tire lower sidewall size. In order to prevent tire damage within the high-speed performance requirements during the design stage, the height of the wear-resistant rubber can be increased to enhance the integrity of the lower sidewall non-rigid material and reduce the torque borne by the decorative block.

[0066] Specifically, the design size requirements are as follows: the design range of the wear-resistant rubber height is: D>A+b / 2;

[0067] Among them, SH is the cross-sectional height of the tire, C is the rubber thickness from the decorative block to the thickest position, H is the rubber thickness at the lower end point of the decorative block, A is the distance from the tire heel to the thickest position of the decorative block, D is the height of the wear-resistant rubber, a is the distance from the thickest position of the decorative block to the upper end point of the decorative block, and b is the distance from the thickest position of the decorative block to the lower end point of the decorative block.

[0068] Step S4: formulate a test plan to verify the effectiveness of the design optimization plan, and optimize and adjust the design optimization plan according to the test results until the high-speed performance requirements are met and the optimal design optimization plan is obtained. The specific steps include:

[0069] Develop a detailed test plan, including test conditions, test methods, and test standards, to evaluate the performance of tires at high speeds;

[0070] Conduct tests according to the test plan, record and analyze the test results, and optimize and adjust the design based on the test results until the high-speed performance requirements are met.

[0071] In this embodiment, as shown in the following table, it is represented as a performance comparison table of the test scheme;

[0072]

[0073] In this embodiment, the high-speed performance of the tire with decorative blocks on the lower sidewall is optimized, and the torque difference is reduced by balancing the thickness size of the lower sidewall and extending the material at the decorative position, thereby improving the high-speed performance of the tire and ensuring that the lower sidewall does not constitute a restrictive factor in high-speed tests.

[0074] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents, and all should be included within the scope of protection of the present invention.

Claims

1. An optimization design method for improving high-speed performance of a tire, characterized in that: The following steps are involved: Step S1, judging whether the evaluation characteristics of the current tire high-speed performance meet the high-speed performance design requirements; Step S2: If the requirements are met, analyzing the tire damage factors under the current high-speed operation of the tire; Step S3, optimizing the high-speed performance of the tire according to the obtained tire damage factors, forming a design optimization scheme, and obtaining a tire that meets the high-speed performance design requirements; Step S4: formulate a test plan to verify the effectiveness of the design optimization plan, and optimize and adjust the design optimization plan according to the test results until the high-speed performance requirements are met and the optimal design optimization plan is obtained.

2. The optimization design method for improving high-speed performance of a tire according to claim 1, characterized in that: The specific steps in step S1 include: The tire includes an upper sidewall, a lower sidewall, and a decorative block; Determine whether the current tire high-speed performance evaluation characteristics meet the high-speed performance design requirements, including: When the thickness difference between the decorative block and the adjacent upper or lower sidewall material is ≥2mm, and the local thickness difference is too narrow and the range is ≤10mm, the high-speed performance design of the tire is evaluated to assess whether it meets the high-speed performance design requirements.

3. The optimization design method for improving high-speed performance of a tire according to claim 1, characterized in that: The specific steps in step S2 include: Tire high-speed performance requirements, including: When the tire is running, the tire carcass cord and wire ring are rigid materials, and the rubber parts are elastic materials, which causes a difference in rotational inertia between parts; and the different densities of the materials increase the difference in inertia between parts; Under specific environmental conditions, load the required load, start running at a specific starting speed, and gradually increase the speed after running for the required time until the tire runs to the test standard corresponding to the speed level; If the tire is not damaged, it passes the high-speed performance test requirements.

4. The optimization design method for improving high-speed performance of a tire according to claim 1, characterized in that: The specific steps in step S3 include: The design optimization scheme includes: By reducing the thickness difference between the lower sidewall decorative block and the non-rigid material at the tire bead, the torque difference is reduced and the high-speed performance is improved; Changing the size of the wear-resistant rubber, enhancing the integrity of the wear-resistant rubber and the sidewall rubber, extending the torque sharing range, reducing local torque, and enhancing the high-speed performance of the tire; Among them, the section height range is SH>102mm, CH≥2.0mm; The design range of wear-resistant rubber height is: D>A+b / 2; Among them, SH is the cross-sectional height of the tire, C is the rubber thickness from the decorative block to the thickest position, H is the rubber thickness at the lower end point of the decorative block, A is the distance from the tire heel to the thickest position of the decorative block, D is the height of the wear-resistant rubber, a is the distance from the thickest position of the decorative block to the upper end point of the decorative block, and b is the distance from the thickest position of the decorative block to the lower end point of the decorative block.

5. The optimization design method for improving high-speed performance of a tire according to claim 1, characterized in that: The specific steps in step S4 include: Develop a detailed test plan, including test conditions, test methods, and test standards, to evaluate the performance of tires at high speeds; Conduct tests according to the test plan, record and analyze the test results, and optimize and adjust the design based on the test results until the high-speed performance requirements are met.

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