Method for improving abnormal running noise of tire

Abstract

The invention provides a method for improving abnormal running noise of a tire, and belongs to the technical field of tires. The method for improving the abnormal running noise of the tire comprises the following steps: step 1, changing a vulcanization setting pressure value in a vulcanization process; 2, the stability of tire uniformity data numerical values is guaranteed; in the step 1, the number of the ecological tire grabbing walls is eight after the tire is formed. In the step 2, the value of the tire uniformity R9H is 2.8. In the step 1, the setting pressure value in the vulcanization process is 7.8. By adjusting the tire process, the uniformity (R9H) of the tire is ensured by ensuring stable shaping pressure in the vulcanizing process of the tire, the forming process is controlled to reduce the deformation of the green tire, abnormal noise and customer complaints are avoided, the green tire grabbing arms are changed from 6 to 8 in the circumferential direction after the tire is formed, and the deformation of the green tire is reduced. And therefore, abnormal noise generated during running of the tire is prevented.

Description

Technical Field

[0001] The present application relates to the field of tires, and in particular to a method for improving abnormal noise caused by tire driving. Background Art

[0002] The birth and development of automobiles is a great achievement of the world's scientific and technological progress and an important footprint of human progress, which has enabled mankind to move from the horse-drawn carriage era to an automobile industry era. In the early days of automobiles, in order to meet the comfort, handling stability and power of automobiles, scientists continued to conduct research and innovation, and continuously promoted the progress and innovation of the tire industry.

[0003] Tires are circular elastic rubber products that roll on the ground and are installed on various vehicles or machines. They are usually installed on metal rims, can support the vehicle body, buffer external impacts, achieve contact with the road surface and ensure the driving performance of the vehicle. Tires are often used under complex and harsh conditions. They are subjected to various deformations, loads, forces, and high and low temperature effects when driving, so they must have high load-bearing performance, traction performance, and buffering performance. At the same time, they are also required to have high wear resistance and flex resistance, as well as low rolling resistance and heat generation.

[0004] As the only part of a car that comes into contact with the ground, the performance of tires directly affects the safety of vehicle drivers and passengers. The importance of tire performance can be imagined, and various countries have also made clear requirements for tire safety performance. With the rapid development of the automotive industry, consumers have begun to pay attention to the comfort, handling stability, NVH and other performance of the entire vehicle in addition to paying attention to tire safety performance.

[0005] However, current tires have poor uniformity during vulcanization, which causes noise and abnormal noise when the tires are driving, often leading to customer complaints. Therefore, there is an urgent need to improve the stability of the tires during vulcanization and reduce abnormal noise when the tires are driving. Summary of the invention

[0006] In order to make up for the above shortcomings, the present application provides a method for improving abnormal noise caused by tire driving, aiming to improve the poor uniformity of the tire during vulcanization molding, which causes the tire to make noise when driving and is very prone to abnormal noise, which often leads to customer complaints. Therefore, it is urgent to improve the stability of the tire during vulcanization molding and reduce the problem of abnormal noise caused by the tire when driving.

[0007] The embodiment of the present application provides a method for improving abnormal tire driving noise, comprising the following steps: Step 1: changing the vulcanization setting pressure value during the vulcanization process;

[0008] Step 2: Ensure the stability of tire uniformity data values.

[0009] In a specific embodiment, in step 1, the tire has 8 ecological grip sidewalls after being molded.

[0010] In a specific embodiment, in step 2, the value of the tire uniformity R9H is 2.8.

[0011] In a specific embodiment, in step 1, the setting pressure value during the vulcanization process is 7.8.

[0012] In a specific embodiment, the method for improving abnormal tire driving noise also includes step 3: the base rubber thickness of the center part B = C*α, C is the total rubber thickness of the center part of the tread, the value of α is greater than 0.29, and the crown rubber thickness A>GD-TWI, GD is the depth of the longitudinal groove in the center, and TWI is the tire wear mark height; the base rubber thickness of the longitudinal groove part D = C*β, the value of β is greater than 0.09, and the groove bottom crown rubber thickness d≥C-GD-D; the base rubber thickness of the shoulder part E = B*γ, the value of γ is 0.38-0.61; the base rubber width of the center part L = TW*δ, TW is the tire running surface width, and the value of δ is 0.59-0.71.

[0013] In a specific embodiment, the ratio of the apex height BFH to the tire section height SH satisfies: BFH / SH=20%±5%; the cap ply includes an interval cap ply and a shoulder cap ply using S-type interval winding.

[0014] In a specific embodiment, the spaced cap layer includes an intermediate spaced cap and shoulder spaced caps located at both ends of the intermediate spaced cap, the distance Q between the axial inner end of the shoulder spaced cap and the axial inner end of the shoulder cap layer is not less than 0.51 mm, and the distance P between the axial inner end of the shoulder spaced cap and the center exceeds the longitudinal groove closest to the shoulder.

[0015] In a specific implementation scheme, the width N of the middle spaced cap is 9-11mm, the spacing distance M is 1.9-5.1mm, the width CEW of the shoulder cap layer is 29-41mm, the center base rubber thickness B is 3.9-4.1mm, the crown rubber thickness A is 5.9-6.1mm; the longitudinal groove base rubber thickness D is 1.4mm, the groove bottom cap rubber thickness d is 1.0mm; the shoulder base rubber thickness E is 2.4mm; the center base rubber width L is 53mm.

[0016] In a specific implementation, a noise test is performed on a reference tire at a vehicle speed of 60 km / h. When the test frequency band is 20-1000 Hz and the test frequency band is 20-1500 Hz, the noise value of the tire is reduced compared with the noise value of the reference tire.

[0017] In a specific implementation scheme, the tire and the reference tire are subjected to noise tests at a vehicle speed of 80 km / h. When the test frequency band is 20-1000 Hz, the noise value of the tire is lower than that of the reference tire; when the test frequency band is 20-1500 Hz, the noise value of the tire is increased by less than 1.0 decibel compared with the noise value of the reference tire.

[0018] Beneficial effects: The present application provides a method for improving abnormal noise during tire driving. By adjusting the tire process, the tire is ensured to have a stable shaping pressure during the vulcanization process to ensure the uniformity of the tire (R9H) and the molding process is controlled to reduce the deformation of the green tire, thus avoiding abnormal noise and customer complaints. The green tire gripper arm after the tire is molded has a circumferential change of 6 to 8 pieces, which reduces the deformation of the green tire. This prevents the tire from generating abnormal noise during driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the drawings required for use in the implementation methods will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the structure of a method for improving abnormal tire running noise provided by an embodiment of the present application. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0022] Embodiment 1

[0023] See also Figure 1 , the present application provides a method for improving abnormal tire driving noise, comprising the following steps: Step 1: changing the vulcanization shaping pressure value during the vulcanization process;

[0024] Step 2: Ensure the stability of tire uniformity data values. Among them, by adjusting the tire process, the tire is guaranteed to have a stable molding pressure during the vulcanization process to ensure the uniformity of the tire (R9H) and the molding process control reduces the deformation of the green tire, avoiding abnormal noise and customer complaints. The green tire gripper arm after the tire is formed has 6 to 8 pieces in the circumference to reduce the deformation of the green tire. This prevents the tire from generating abnormal noise when driving.

[0025] In this embodiment, in step 1, the number of ecological gripping sidewalls after tire molding is 8. In step 2, the value of tire uniformity R9H is 2.8. In step 1, the molding pressure value during vulcanization is 7.8.

[0026] In the specific setting, the method for improving the abnormal noise of tire driving also includes step 3: the base rubber thickness B of the center part is C*α, C is the total thickness of the rubber of the center part of the tread, the value of α is greater than 0.29, and the crown rubber thickness A>GD-TWI, GD is the depth of the longitudinal groove of the center part, and TWI is the height of the tire wear mark; the base rubber thickness D of the longitudinal groove part is C*β, the value of β is greater than 0.09, and the groove bottom crown rubber thickness d≥C-GD-D; the base rubber thickness E of the shoulder part is B*γ, the value of γ is 0.38; the base rubber width L of the center part is TW*δ, TW is the width of the tire running surface, and the value of δ is 0.59. The ratio of the apex rubber height BFH to the tire section height SH satisfies: BFH / SH=20%±5%; the cap layer includes an interval cap layer and a shoulder cap layer using S-type interval winding. The spaced cap layer includes a middle spaced cap and shoulder spaced caps located at both ends of the middle spaced cap, the distance Q between the axial inner end of the shoulder spaced cap and the axial inner end of the shoulder cap layer is not less than 0.51mm, and the distance P between the axial inner end of the shoulder spaced cap exceeds the longitudinal groove closest to the shoulder. The width N of the middle spaced cap is 9mm, the spacing distance M is 1.9mm, the width CEW of the shoulder cap layer is 29mm, the center base rubber thickness B is 3.9mm, the cap rubber thickness A is 5.9mm; the longitudinal groove base rubber thickness D is 1.4mm, the groove bottom cap rubber thickness d is 1.0mm; the shoulder base rubber thickness E is 2.4mm; the center base rubber width L is 53mm. The reference tire was tested for noise at a speed of 60 km / h. When the test frequency range was 20-1000 Hz and 20-1500 Hz, the noise value of the tire decreased compared with the noise value of the reference tire. The tire and the reference tire were tested for noise at a speed of 80 km / h. When the test frequency range was 20-1000 Hz, the noise value of the tire decreased compared with the noise value of the reference tire; when the test frequency range was 20-1500 Hz, the noise value of the tire increased by less than 1.0 dB compared with the noise value of the reference tire. Among them, it can be achieved that after the tire is inflated, the center part expands more than the shoulder part, the rigidity is weakened when the center part contacts the ground, and the NVH and comfort are significantly improved; at the same time, the ground contact mark will also show an increase in the middle length and a slight decrease in width. The contact area between the shoulder pattern and the road surface is smaller, and the tire contact surface forms a certain angle with the road groove, which is more conducive to the release of air and reduces noise; due to the increase in the length of the center part, its anti-hydroplaning performance (Hydroplaning) will also be better when driving on wet roads.

[0027] Embodiment 2

[0028] See also Figure 1 , the present application provides a method for improving abnormal tire driving noise, comprising the following steps: Step 1: changing the vulcanization shaping pressure value during the vulcanization process;

[0029] Step 2: Ensure the stability of tire uniformity data values.

[0030] In this embodiment, in step 1, the number of ecological gripping sidewalls after tire molding is 8. In step 2, the value of tire uniformity R9H is 2.8. In step 1, the molding pressure value during vulcanization is 7.8.

[0031] In this embodiment, the method for improving abnormal tire driving noise also includes step 3: the base rubber thickness B of the center part is C*α, C is the total rubber thickness of the center part of the tread, the value of α is greater than 0.29, and the crown rubber thickness A>GD-TWI, GD is the depth of the longitudinal groove of the center part, and TWI is the height of the tire wear mark; the base rubber thickness D of the longitudinal groove part is C*β, the value of β is greater than 0.09, and the groove bottom crown rubber thickness d≥C-GD-D; the base rubber thickness E of the shoulder part is B*γ, the value of γ is 0.61; the base rubber width L of the center part is TW*δ, TW is the tire running surface width, and the value of δ is 0.71. The ratio of the apex rubber height BFH to the tire section height SH satisfies: BFH / SH=20%±5%; the cap layer includes an interval cap layer and a shoulder cap layer using S-type interval winding. The spaced cap layer includes a middle spaced cap and shoulder spaced caps located at both ends of the middle spaced cap, the distance Q between the axial inner end of the shoulder spaced cap and the axial inner end of the shoulder cap layer is not less than 0.51mm, and the distance P between the axial inner end of the shoulder spaced cap exceeds the longitudinal groove closest to the shoulder. The width N of the middle spaced cap is 11mm, the spacing distance M is 5.1mm, the width CEW of the shoulder cap layer is 41mm, the center base rubber thickness B is 4.1mm, the cap rubber thickness A is 6.1mm; the longitudinal groove base rubber thickness D is 1.4mm, the groove bottom cap rubber thickness d is 1.0mm; the shoulder base rubber thickness E is 2.4mm; the center base rubber width L is 53mm. The reference tire was tested for noise at a speed of 60 km / h. When the test frequency range was 20-1000 Hz and 20-1500 Hz, the noise value of the tire was lower than that of the reference tire. The tire and the reference tire were tested for noise at a speed of 80 km / h. When the test frequency range was 20-1000 Hz, the noise value of the tire was lower than that of the reference tire; when the test frequency range was 20-1500 Hz, the noise value of the tire was higher than that of the reference tire by less than 1.0 dB.

[0032] Embodiment 3

[0033] See also Figure 1 , the present application provides a method for improving abnormal tire driving noise, comprising the following steps: Step 1: changing the vulcanization shaping pressure value during the vulcanization process;

[0034] Step 2: Ensure the stability of tire uniformity data values.

[0035] In this embodiment, in step 1, the number of ecological gripping sidewalls after tire molding is 8. In step 2, the value of tire uniformity R9H is 2.8. In step 1, the molding pressure value during the vulcanization process is 7.8.

[0036] In this embodiment, the method for improving abnormal tire driving noise also includes step 3: the base rubber thickness B of the center part is C*α, C is the total rubber thickness of the center part of the tread, the value of α is greater than 0.29, and the crown rubber thickness A>GD-TWI, GD is the depth of the longitudinal groove of the center part, and TWI is the height of the tire wear mark; the base rubber thickness D of the longitudinal groove part is C*β, the value of β is greater than 0.09, and the groove bottom crown rubber thickness d≥C-GD-D; the base rubber thickness E of the shoulder part is B*γ, the value of γ is 0.5; the base rubber width L of the center part is TW*δ, TW is the tire running surface width, and the value of δ is 0.6. The ratio of the apex rubber height BFH to the tire section height SH satisfies: BFH / SH=20%±5%; the cap layer includes an interval cap layer and a shoulder cap layer using S-type interval winding. The spaced cap layer includes a middle spaced cap and shoulder spaced caps located at both ends of the middle spaced cap, the distance Q between the axial inner end of the shoulder spaced cap and the axial inner end of the shoulder cap layer is not less than 0.51mm, and the distance P between the axial inner end of the shoulder spaced cap exceeds the longitudinal groove closest to the shoulder. The width N of the middle spaced cap is 10mm, the spacing distance M is 2mm, the width CEW of the shoulder cap layer is 30mm, the center base rubber thickness B is 4mm, the cap rubber thickness A is 6mm; the longitudinal groove base rubber thickness D is 1.4mm, the groove bottom cap rubber thickness d is 1.0mm; the shoulder base rubber thickness E is 2.4mm; the center base rubber width L is 53mm. The reference tire was tested for noise at a speed of 60 km / h. When the test frequency range was 20-1000 Hz and 20-1500 Hz, the noise value of the tire was lower than that of the reference tire. The tire and the reference tire were tested for noise at a speed of 80 km / h. When the test frequency range was 20-1000 Hz, the noise value of the tire was lower than that of the reference tire; when the test frequency range was 20-1500 Hz, the noise value of the tire was higher than that of the reference tire by less than 1.0 dB.

[0037] Embodiment 4

[0038] See also Figure 1 , the present application provides a method for improving abnormal tire driving noise, comprising the following steps: Step 1: changing the vulcanization shaping pressure value during the vulcanization process;

[0039] Step 2: Ensure the stability of tire uniformity data values.

[0040] In this embodiment, in step 1, the number of ecological gripping sidewalls after tire molding is 8. In step 2, the value of tire uniformity R9H is 2.8. In step 1, the molding pressure value during vulcanization is 7.8.

[0041] In this embodiment, the method for improving abnormal tire driving noise also includes step 3: the base rubber thickness B of the center part is C*α, C is the total rubber thickness of the center part of the tread, the value of α is greater than 0.29, and the crown rubber thickness A>GD-TWI, GD is the depth of the longitudinal groove of the center part, and TWI is the height of the tire wear mark; the base rubber thickness D of the longitudinal groove part is C*β, the value of β is greater than 0.09, and the groove bottom crown rubber thickness d≥C-GD-D; the base rubber thickness E of the shoulder part is B*γ, the value of γ is 0.5; the base rubber width L of the center part is TW*δ, TW is the tire running surface width, and the value of δ is 0.6. The ratio of the apex rubber height BFH to the tire section height SH satisfies: BFH / SH=20%±5%; the cap layer includes an interval cap layer and a shoulder cap layer using S-type interval winding. The spaced cap layer includes a middle spaced cap and shoulder spaced caps located at both ends of the middle spaced cap, the distance Q between the axial inner end of the shoulder spaced cap and the axial inner end of the shoulder cap layer is not less than 0.50 mm, and the distance P between the axial inner end of the shoulder spaced cap exceeds the longitudinal groove closest to the shoulder. The width N of the middle spaced cap is 10 mm, the spacing distance M is 3 mm, the width CEW of the shoulder cap layer is 35 mm, the center base rubber thickness B is 4 mm, the cap rubber thickness A is 6 mm; the longitudinal groove base rubber thickness D is 1.4 mm, the groove bottom cap rubber thickness d is 1.0 mm; the shoulder base rubber thickness E is 2.4 mm; the center base rubber width L is 53 mm. The reference tire was tested for noise at a speed of 60 km / h. When the test frequency range was 20-1000 Hz and 20-1500 Hz, the noise value of the tire was lower than that of the reference tire. The tire and the reference tire were tested for noise at a speed of 80 km / h. When the test frequency range was 20-1000 Hz, the noise value of the tire was lower than that of the reference tire; when the test frequency range was 20-1500 Hz, the noise value of the tire was higher than that of the reference tire by less than 1.0 dB.

[0042] The working principle of the method for improving abnormal tire driving noise is as follows: by adjusting the tire process, the tire is ensured to have a stable molding pressure during the vulcanization process to ensure the uniformity of the tire (R9H) and the molding process is controlled to reduce the deformation of the green tire, avoiding abnormal noise and customer complaints. After the tire is molded, the green tire gripper arm changes from 6 to 8 pieces in the circumferential direction to reduce the deformation of the green tire. This prevents the tire from generating abnormal noise during driving.

[0043] The above description is only an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

Claims

1. A method for improving abnormal tire driving noise, characterized in that: The following steps are involved: Step 1: Change the vulcanization setting pressure value during the vulcanization process; Step 2: Ensure the stability of tire uniformity data values.

2. The method for improving abnormal tire driving noise according to claim 1, characterized in that: In step 1, the tire has 8 ecological grip sidewalls after forming.

3. The method for improving abnormal tire driving noise according to claim 1, characterized in that: In step 2, the tire uniformity R9H value is 2.

8.

4. The method for improving abnormal tire running noise according to claim 1, characterized in that: In step 1, the setting pressure value during the vulcanization process is 7.

8.

5. The method for improving abnormal tire running noise according to claim 1, characterized in that: It also includes step 3: the base rubber thickness of the center part B = C*α, C is the total rubber thickness of the center part of the tread, the value of α is greater than 0.29, and the crown rubber thickness A>GD-TWI, GD is the depth of the longitudinal groove in the center, and TWI is the tire wear mark height; the base rubber thickness of the longitudinal groove part D = C*β, the value of β is greater than 0.09, and the crown rubber thickness of the groove bottom d≥C-GD-D; the base rubber thickness of the shoulder part E = B*γ, the value of γ is 0.38-0.61; the base rubber width of the center part L = TW*δ, TW is the tire running surface width, and the value of δ is 0.59-0.

71.

6. The method for improving abnormal tire running noise according to claim 5, characterized in that: The ratio of the apex height BFH to the tire section height SH satisfies: BFH / SH=20%±5%; the cap ply includes an interval cap ply and a shoulder cap ply using S-type interval winding.

7. The method for improving abnormal tire running noise according to claim 6, characterized in that: The spaced cap layer includes an intermediate spaced cap and shoulder spaced caps located at both ends of the intermediate spaced cap respectively. The distance Q between the axial inner end of the shoulder spaced cap and the axial inner end of the shoulder cap layer is not less than 0.51 mm, and the distance P between the axial inner end of the shoulder spaced cap and the center exceeds the longitudinal groove closest to the shoulder.

8. The method for improving abnormal tire running noise according to claim 7, characterized in that: The width N of the middle-spaced cap is 9-11mm, the spacing distance M is 1.9-5.1mm, the width CEW of the shoulder cap layer is 29-41mm, the center base rubber thickness B is 3.9-4.1mm, the crown rubber thickness A is 5.9-6.1mm; the longitudinal groove base rubber thickness D is 1.4mm, the groove bottom cap rubber thickness d is 1.0mm; the shoulder base rubber thickness E is 2.4mm; the center base rubber width L is 53mm.

9. The method for improving abnormal tire running noise according to claim 8, characterized in that: The noise value of the reference tire was tested at a vehicle speed of 60 km / h. When the test frequency band was 20-1000 Hz and the test frequency band was 20-1500 Hz, the noise value of the tire was lower than that of the reference tire.

10. The method for improving abnormal tire running noise according to claim 8, characterized in that: The tires and the reference tires were tested for noise at a vehicle speed of 80 km / h. When the test frequency band was 20-1000 Hz, the noise value of the tires decreased compared with the noise value of the reference tires. When the test frequency band was 20-1500 Hz, the noise value of the tires increased by less than 1.0 decibel compared with the noise value of the reference tires.

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