Tire with improved wear and method for improving wear of tire

Abstract

The present invention relates to the field of tire design and manufacturing, and discloses a wear-improved tire, the tire comprises a tread layer, a cap ply, a steel belt ply and a cord fabric ply, the tread layer comprises crown rubber, base rubber and tread lower rubber, the width of the base rubber is 40-70% of the width of the tread layer, the thickness of the base rubber is 30-50% of the thickness of the tread layer, and the width of the cord fabric ply is 40-70% of the width of the tread layer. The modulus of the base rubber is 1.5-3 times that of the crown rubber, and the Local NG range of the tread rubber is 30-60%. By optimizing the width, the thickness and the modulus of the base rubber and the Local NG ratio of the tread rubber, the wear rate of the middle part of the tire crown is reduced, so that the overall wear resistance and the driving safety of the tire are improved.

Description

Technical Field

[0001] The invention relates to the field of tire design and manufacturing, and in particular to a tire with improved wear and a method for improving tire wear. Background Art

[0002] With the rapid development of the automobile industry, tires, as important components of automobiles, have a direct impact on driving safety and economy due to their performance. In recent years, especially with the popularity of new energy vehicles, the wear of tires has attracted widespread attention. Studies have shown that due to the large starting torque and increased vehicle weight, the wear of tires of new energy vehicles is often better than that of traditional fuel vehicles. Among them, the wear in the middle part is particularly serious, mainly due to uneven force and unreasonable ground pressure distribution. Existing tire designs lack effective solutions to the problem of eccentric wear in the middle. In order to improve the wear resistance and service life of tires, comprehensive improvements must be made starting from tire materials, structures and design parameters.

[0003] The base rubber is part of the tire structure. It is located under the tire crown and plays a role in buffering and supporting the crown. Its width and other parameters have an important impact on the overall performance of the tire, including crown wear. Appropriate base rubber width and thickness can provide better buffering, and when the tire contacts the ground, the pressure can be more evenly distributed on the crown. However, if the base rubber width and thickness are too large, the overall weight of the tire will increase, the cost will increase, the steering response of the tire will be affected, and it may also cause poor heat dissipation of the tire and limit the design space of the tire pattern. The design of the tire pattern has a certain impact on the handling and comfort of the tire. The appropriate base rubber modulus has the ability to resist deformation, can provide stronger support for the crown, and reduce irregular wear of the crown. However, if the base rubber modulus is too large, it will cause other problems for the tire, such as reducing its buffering capacity, deteriorating steering response characteristics, and affecting the grip between the tire and the ground. In addition, the tread sea-to-land ratio will affect the tire's drainage performance, grip, handling performance, wear resistance and other aspects. Therefore, it is very necessary to properly design the base rubber specifications and the tread sea-to-land ratio. Summary of the invention

[0004] The present invention aims at the deficiencies of the prior art and provides a tire with improved wear, the overall wear resistance and driving safety of the tire are improved to a certain extent.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: A wear-improved tire, comprising a tread layer, a cap layer, a steel belt layer, and a cord layer, wherein the tread layer comprises a tread cap rubber, a base rubber, and a tread lower rubber, wherein the width of the base rubber is 40-70% of the width of the tread layer, the thickness of the base rubber is 30-50% of the tread layer, the modulus of the base rubber is 1.5-3 times the modulus of the tread cap rubber, and the Local NG range of the tread rubber is 30-60%; The modulus is the modulus under 10% tensile stress; The Local NG=shoulder NG / center NG, NG%=∑BlockArea / (TAW×PitchLength)×100%, Among them, ∑BlockArea is the total area of ​​the tread layer actually in contact with the ground, TAW is the total width of the tread layer, PitchLength is the length of the tread pattern pitch, shoulder is the shoulder area of ​​the tread layer, and center is the area from the crown centerline of the tread layer to the boundary of the shoulder area of ​​the tread layer.

[0006] Preferably, the width of the base rubber is 60-70% of the width of the tread layer.

[0007] Preferably, the modulus of the base rubber is 2.5-3 times the modulus of the crown rubber.

[0008] Preferably, the Local NG range of the tread rubber is 50-60%.

[0009] Preferably, the width of the base rubber is 70% of the width of the tread layer, the thickness of the base rubber is 50% of the tread layer, the modulus of the base rubber is 3 times the modulus of the crown rubber, and the Local NG range of the tread rubber is 60%.

[0010] Preferably, the modulus is measured by referring to the GB / T528 method.

[0011] Furthermore, the present invention also provides a method for improving tire wear, wherein the tire comprises a tread layer, a cap layer, a steel belt layer and a cord layer, wherein the tread layer comprises a cap rubber, a base rubber and a tread lower rubber; the method comprises the following steps: (a) The width of the base rubber is designed to be 40% to 70% of the total width of the tread layer, the thickness is designed to be 30% to 50% of the thickness of the tread layer, and the modulus is designed to be 1.5 to 3 times the modulus of the crown rubber, and the modulus is the modulus under 10% constant tensile stress; (b) adjusting the Local NG value of the tread rubber so that it falls within the range of 30% to 60%, wherein the Local NG value is calculated by the ratio of the NG value of the shoulder area of ​​the tread layer to the NG value from the crown centerline to the shoulder area boundary; The Local NG=shoulder NG / center NG, NG%=∑BlockArea / (TAW×PitchLength)×100%, Among them, ∑BlockArea is the total area of ​​the tread layer actually in contact with the ground, TAW is the total width of the tread layer, PitchLength is the length of the tread pattern pitch, shoulder is the shoulder area of ​​the tread layer, and center is the area from the crown centerline of the tread layer to the boundary of the shoulder area of ​​the tread layer; (c) Optimizing the tire structure through steps (a) and (b) reduces the wear rate of the middle part of the tread and improves the overall wear resistance and driving safety of the tire.

[0012] Preferably, in step (a), the width of the base rubber is preferably 60% to 70% of the width of the tread layer.

[0013] Preferably, in step (a), the modulus of the base rubber is 2.5 to 3 times the modulus of the crown rubber.

[0014] Preferably, in the step (b), the Local NG value of the tread rubber is preferably 50% to 60%.

[0015] Preferably, in the optimization step, the width of the base rubber is set to 70%, the thickness is set to 50%, the modulus is set to 3 times the modulus of the crown rubber, and the Local NG value of the tread rubber is set to 60%, thereby significantly reducing the wear of the middle part of the tire tread.

[0016] The present invention adopts the above-mentioned technical solution, and realizes effective regulation of the tire ground contact pressure distribution by scientifically and accurately optimizing the key structural parameters of the tire (including the width, thickness and modulus of the base rubber, and the Local NG value of the tread rubber). Specifically, the reasonable setting of the base rubber parameters can form a more uniform pressure distribution when the tire contacts the ground, significantly reducing the local wear rate in the middle of the tread, thereby extending the service life of the tire; at the same time, by adjusting the Local NG value of the tread rubber, the wear characteristics of the tire when in contact with the ground are further optimized, and the driving stability and handling performance of the tire under high-speed or high-load conditions are improved. In addition, the optimized design of the present invention not only helps to improve the wear resistance of the tire, but also effectively reduces the safety hazards caused by uneven wear, providing a more reliable tire product guarantee for new energy and high-performance vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the definition of shoulder NG and center NG. DETAILED DESCRIPTION

[0018] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with 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.

[0019] The present invention provides a tire with improved wear, the tire comprising a tread layer, a cap layer, a steel belt layer, and a cord layer, the tread layer comprising a crown rubber, a base rubber, and a tread lower rubber, the width of the base rubber is 40-70% of the width of the tread layer, the thickness of the base rubber is 30-50% of the tread layer, the modulus of the base rubber is 1.5-3 times the modulus of the crown rubber, and the LocalNG range of the tread rubber is 30-60%; The modulus is the modulus under 10% tensile stress; The Local NG=shoulder NG / center NG, NG%=∑BlockArea / (TAW×PitchLength)×100%, Among them, ∑BlockArea is the total area of ​​the tread layer actually in contact with the ground, TAW is the total width of the tread layer, PitchLength is the length of the tread pattern pitch, shoulder is the shoulder area of ​​the tread layer, and center is the area from the crown centerline of the tread layer to the boundary of the shoulder area of ​​the tread layer.

[0020] The base rubber is part of the tire structure. It is located under the tire crown and plays a role in cushioning and supporting the crown. Its width and other parameters have an important impact on the overall performance of the tire, including crown wear. Appropriate base rubber width and thickness can provide better cushioning, and when the tire contacts the ground, the pressure can be more evenly distributed on the crown. Appropriate base rubber modulus has the ability to resist deformation, can provide stronger support for the crown, and reduce irregular wear of the crown. In addition, the tread sea-to-land ratio will affect the tire's drainage performance, grip, handling performance, wear resistance and other aspects.

[0021] In the present invention, by optimizing the width, thickness, modulus of the base rubber and the Local NG ratio of the tread rubber, the wear rate of the middle part of the tire crown is reduced, thereby improving the overall wear resistance and driving safety of the tire.

[0022] In the wear-improved tire, the width of the base rubber is 40-70% of the width of the tread layer, for example, it can be 40%, 45%, 50%, 55%, 60%, 65%, 70%, etc., preferably 60-70%.

[0023] In the wear-improved tire, the thickness of the base rubber is 30-50% of the tread layer, for example, it can be 30%, 35%, 40%, 45%, 50%, etc.

[0024] In the wear-improved tire, the modulus of the base rubber is 1.5-3 times the modulus of the crown rubber, for example, it can be 1.5 times, 2 times, 2.5 times, 3 times, etc., preferably 2.5-3 times.

[0025] In the wear-improved tire, the Local NG range of the tread rubber is 30-60%, for example, it can be 30%, 35%, 40%, 45%, 50%, 55%, 60%, etc., preferably 50-60%.

[0026] In a preferred embodiment of the present invention, the width of the base rubber is 70% of the width of the tread layer, the thickness of the base rubber is 50% of the tread layer, the modulus of the base rubber is 3 times the modulus of the crown rubber, and the Local NG range of the tread rubber is 60%.

[0027] The modulus under 10% elongation stress is determined by referring to GB / T528 method.

[0028] The technical solution of the present invention will be further described below in conjunction with embodiments.

[0029] The tire specifications used in the embodiment and the comparative example are 235 / 45R18, and the local NG settings of the base rubber and the tread are shown in Tables 1 and 2 respectively, and the rest are the same. The tires of the embodiment and the comparative example were subjected to a 50,000-kilometer actual vehicle test to record the remaining depth of the tread layer. The test results are shown in Tables 1 and 2 respectively. Table 1 Example width(%) thickness(%) Modulus multiple Local NG (%) Remaining Depth Example 1 40 30 1.5 30 2.3 Example 2 45 35 1.5 35 2.3 Example 3 50 40 2.0 40 2.5 Example 4 55 45 2.0 45 2.6 Example 5 60 50 2.5 50 2.7 Example 6 65 30 2.5 55 2.8 Example 7 70 30 3.0 60 2.8 Example 8 40 30 1.6 30 2.2 Example 9 50 40 2.1 35 2.4 Example 10 60 50 2.6 55 2.6 Embodiment 11 70 50 3.0 60 2.9 Table 2 Comparative Example width(%) thickness(%) Modulus multiple Local NG (%) Remaining depth (mm) Comparative Example 1 75 20 1.2 20 0.4 Comparative Example 2 80 25 1.1 25 0.3 Comparative Example 3 85 15 1.0 10 0.2 Comparative Example 4 70 25 3.0 60 1.3 Comparative Example 5 70 55 3.0 60 1.5 Comparative Example 6 70 50 1.3 60 1.7 Comparative Example 7 70 50 3.2 60 1.4 Comparative Example 8 70 50 3.0 25 1.5 Comparative Example 9 70 50 3.0 65 1.2 Comparative Example 10 35 50 3.0 60 1.2 Comparative Example 11 75 50 3.0 60 1.1 It can be seen from Table 1 and Table 2 that the wear of the embodiment is significantly better than that of the comparison example, and the wear of embodiment 11 is significantly better than that of comparison examples 4-11. Therefore, scientifically setting the width, thickness, modulus of the base rubber and the Local NG of the tread rubber can effectively reduce the wear of the middle part of the tread.

[0030] The above is a description of the embodiments of the present invention. Through the above description of the disclosed embodiments, professionals and technicians in the field can implement or use the present invention. Various modifications to these embodiments will be apparent to professionals and technicians in the field. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown in this article, but will conform to the widest range consistent with the principles and novelties disclosed herein.

Claims

1. A wear-improved tire, comprising a tread layer, a cap layer, a steel belt layer, and a cord layer, wherein the tread layer comprises a cap rubber, a base rubber, and a tread lower rubber, characterized in that: The width of the base rubber is 40-70% of the width of the tread layer, the thickness of the base rubber is 30-50% of the tread layer, the modulus of the base rubber is 1.5-3 times the modulus of the crown rubber, and the LocalNG range of the tread rubber is 30-60%; The modulus is the modulus under 10% tensile stress; The Local NG=shoulder NG / center NG, NG%=∑BlockArea / (TAW×PitchLength)×100%, Among them, ∑BlockArea is the total area of ​​the tread layer actually in contact with the ground, TAW is the total width of the tread layer, PitchLength is the length of the tread pattern pitch, shoulder is the shoulder area of ​​the tread layer, and center is the area from the crown centerline of the tread layer to the boundary of the shoulder area of ​​the tread layer.

2. A wear-improved tire according to claim 1, characterized in that: The width of the base rubber is 60-70% of the width of the tread layer.

3. A tire with improved wear according to claim 1, characterized in that: The modulus of the base rubber is 2.5-3 times that of the crown rubber.

4. A tire with improved wear according to claim 1, characterized in that: The Local NG range of the tread rubber is 50-60%.

5. The wear-improved tire according to claim 1, characterized in that: The width of the base rubber is 70% of the width of the tread layer, the thickness of the base rubber is 50% of the tread layer, the modulus of the base rubber is 3 times the modulus of the crown rubber, and the Local NG range of the tread rubber is 60%.

6. A method for improving tire wear, the tire comprising a tread layer, a cap layer, a steel belt layer and a cord layer, wherein the tread layer comprises a cap rubber, a base rubber and a tread lower rubber; characterized in that: The method comprises the following steps: (a) designing the width of the base rubber to be 40% to 70% of the total width of the tread layer, the thickness to be 30% to 50% of the thickness of the tread layer, and the modulus to be 1.5 to 3 times the modulus of the crown rubber, wherein the modulus is the modulus under 10% constant tensile stress; (b) adjusting the Local NG value of the tread rubber to fall within the range of 30% to 60%, wherein the Local NG value is calculated by the ratio of the NG value of the shoulder area of ​​the tread layer to the NG value from the center line of the crown to the boundary of the shoulder area; The Local NG=shoulder NG / center NG, NG%=∑BlockArea / (TAW×PitchLength)×100%, Wherein, ∑BlockArea is the total area of ​​the tread layer actually in contact with the ground, TAW is the total width of the tread layer, PitchLength is the length of the tread pattern pitch, shoulder is the shoulder area of ​​the tread layer, and center is the area from the crown centerline of the tread layer to the boundary of the shoulder area of ​​the tread layer; (c) optimizing the tire structure through steps (a) and (b), thereby reducing the wear rate of the middle part of the tread and improving the overall wear resistance and driving safety of the tire.

7. The method according to claim 6, characterized in that In the step (a), the width of the base rubber is preferably 60% to 70% of the width of the tread layer.

8. The method according to claim 6, characterized in that In the step (a), the modulus of the base rubber is preferably 2.5 to 3 times the modulus of the crown rubber.

9. The method according to claim 6, characterized in that In the step (b), the Local NG value of the tread rubber is preferably 50% to 60%.

10. The method according to claim 6, characterized in that In the optimization step, the width of the base rubber is set to 70%, the thickness is set to 50%, the modulus is set to 3 times the modulus of the crown rubber, and the Local NG value of the tread rubber is set to 60%, thereby significantly reducing the wear in the middle part of the tire tread.

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