A method for testing the durability of a tire simulating actual damage conditions of the tire shoulder

Abstract

The application discloses a kind of tire endurance test methods simulating actual damage condition of tire shoulder, solve the problem that tire shoulder damage is not considered in the tire test process in prior art, with the beneficial effect of improving tire performance, specific scheme is as follows: a kind of tire endurance test methods simulating actual damage condition of tire shoulder, including in the tire of real car use Data acquisition component is set to obtain the actual temperature information of tire shoulder before tire damage, actual load information, air pressure information and real-time speed;Actual temperature information, actual load information and air pressure information obtained before tire shoulder damage, real-time speed of tire is input into tire laboratory durability testing machine, and test conditions of test tire are determined according to the above data;Start test, test tire is checked after every set of kilometers, check the air pressure of test tire, and check the appearance of test tire.

Description

Technical Field

[0001] This invention relates to the field of tire durability testing, and in particular to a tire durability testing method that simulates actual tire shoulder damage conditions. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] The tire shoulder (the transition area between the tread and the sidewall) is a critical part that bears complex stresses, and damage to it will affect the tire's handling, durability and safety.

[0004] Common types of tire shoulder damage include heat damage, characterized by sticky, hardened, or burned rubber on the shoulder. This is primarily caused by prolonged high-speed driving, low tire pressure combined with high-speed driving, or low tire pressure combined with high-speed driving. Shoulder delamination is mainly caused by a bulge in the shoulder area, possibly accompanied by internal cord breakage. This is primarily due to poor adhesion between the rubber and cords, or overloading combined with high-speed driving (excessive stress on the shoulder, damaging the internal belt layer structure).

[0005] In existing technologies, tire durability is tested through laboratory durability tests. However, the environmental conditions during the test are usually obtained based on experience. After the tire has been driven for a set number of kilometers, the damage to the tire, including whether there is damage to the tire shoulder, is observed. However, the test does not take into account relevant data such as temperature and air pressure before the tire shoulder is damaged. This makes it impossible to make corresponding adjustment plans for the tire shoulder structure, or the adjustment plan is not targeted at the tire shoulder. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a tire durability testing method that simulates actual tire shoulder damage conditions. By using relevant information about the tire before tire shoulder damage as the test conditions for the test tire, the method simulates the tire's operation under complex working conditions and determines the cause of damage, thereby improving tire performance.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0008] A tire durability testing method simulating actual tire shoulder damage conditions includes the following:

[0009] Data acquisition components are installed in the tires used in actual vehicles to obtain the actual temperature, actual load, air pressure and real-time speed of the actual vehicle tires before the tire shoulder is damaged.

[0010] The actual temperature, load, and air pressure information of the actual vehicle tire before the tire shoulder damage, as well as the real-time rotation speed of the tire, are input into the tire laboratory durability testing machine, and the test conditions of the test tire are determined based on the above data.

[0011] The test begins, and the test tires are inspected every set distance. The tire pressure and appearance are checked. If any damage is found on the test tires, the relevant test data is recorded and the cause of the damage is determined.

[0012] Based on the cause of the test tire damage, the tire was improved, the improved tire was tested, and then released to the market.

[0013] The tire durability test method described above, which simulates actual tire shoulder damage conditions, involves a sudden change in tire pressure when the tire shoulder suddenly fails. The actual temperature, load, real-time speed, and tire pressure of the actual vehicle tire before the tire shoulder failure are determined by using the actual temperature, load, real-time speed, and tire pressure information before the sudden change in tire pressure.

[0014] The tire durability test method described above, which simulates actual tire shoulder damage conditions, includes the following test conditions for the test tire:

[0015] Temperature: The ambient temperature of the test tire was ±3℃, based on the actual temperature of the tire on the actual vehicle before the tire shoulder was damaged.

[0016] Load: The actual load information of the actual vehicle tires before tire shoulder damage is used as the load value of the test tire;

[0017] Air pressure: The actual air pressure of the vehicle's tires before the tire shoulder was damaged was used as the air pressure value of the test tire;

[0018] Rotation speed: The real-time rotation speed of the actual vehicle tire before the tire shoulder was damaged was used as the speed value of the test tire.

[0019] The tire durability test method described above, which simulates actual tire shoulder damage conditions, uses data acquisition components installed inside the actual vehicle tire to obtain the temperature, load, air pressure, and real-time rotation speed of the actual vehicle tire.

[0020] As described above, in a tire durability test method simulating actual tire shoulder damage conditions, the data acquisition component is attached to the center of the tire liner, and the centerline of the data acquisition component is set along the tangent direction of the center of the tire liner.

[0021] The tire durability test method described above, which simulates actual tire shoulder damage conditions, includes a data acquisition component comprising a temperature sensor, an acceleration sensor, and a pressure sensor, which are integrated together. The data acquisition component is connected to a controller via wireless signal transmission.

[0022] The tire durability test method described above, which simulates actual tire shoulder damage conditions, obtains the actual load information by combining the acceleration data acquired by the acceleration sensor with the contact duration and the tire arc length during tire travel. The contact duration during tire travel is determined based on the Z-axis signal of the acceleration sensor.

[0023] The real-time rotational speed of the vehicle's tires is obtained using an acceleration sensor.

[0024] As described above, a tire durability test method simulating actual tire shoulder damage conditions involves visually inspecting the test tire for the following: tread, sidewall, ply, airtight layer, belt layer, bead delamination, ply cracks, cord peeling, cord breakage, chipping, joint cracking, crazing, and abnormal tire body deformation.

[0025] As described above, a tire durability test method simulating actual tire shoulder damage conditions involves cutting a cross-section of the damaged area of ​​the test tire when it is determined that the test tire has external damage. The cause of the damage is then determined by the cross-section, whether it is thermal fatigue damage or stress damage at the end of the tire belt layer.

[0026] The tire durability testing method described above, which simulates actual tire shoulder damage conditions, includes the following steps for improving the tire based on the causes of damage:

[0027] If it is determined that the test tire is damaged due to thermal fatigue, the tire composition is changed by reducing heat generation; if it is determined that the test tire is damaged due to stress at the end of the tire belt layer, the structure of the belt layer is adjusted to reduce the stress.

[0028] The beneficial effects of the present invention are as follows:

[0029] 1) This invention obtains the actual temperature, actual load, and air pressure information of the tire shoulder before it is damaged by setting a data acquisition component in the tire used in a real vehicle. It also obtains the real-time rotation speed of the actual tire and the real-time rotation speed of the tire before the tire shoulder is damaged. The above information is used as the test conditions for the test tire. In other words, by adjusting the laboratory durability test conditions based on the actual damage conditions at the tire shoulder, the test results can accurately reflect the cause of tire failure in actual use. This facilitates tire improvement, improves tire structure, makes the improvement more targeted, and improves tire durability.

[0030] 2) In this invention, when the tire shoulder is suddenly damaged, the tire pressure will change suddenly. This is used as a signal to determine the actual temperature information, actual load information and tire pressure information before the tire shoulder is damaged by using the actual temperature information, actual load information and tire pressure information before the tire pressure changes suddenly.

[0031] 3) In this invention, the test conditions for the test tire are determined based on the actual temperature information of the tire shoulder before damage, the actual load information of the tire shoulder before damage is used as the load value of the test tire, the actual air pressure information of the tire shoulder before damage is used as the air pressure value of the test tire, and the real-time rotation speed of the tire before damage is used as the speed value of the test tire, so as to ensure the accuracy of the test conditions and test results.

[0032] 4) The data acquisition components in this invention include a temperature sensor, an acceleration sensor, and a pressure sensor. These three sensors are integrated into one unit, which is convenient to install, occupies a small area, and will not affect the normal use of the tire. The acceleration sensor can obtain the actual load information, which is helpful to limit the load requirements during the test. Attached Figure Description

[0033] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0034] Figure 1 This is a flowchart of a tire durability test method simulating actual tire shoulder damage conditions according to one or more embodiments of the present invention.

[0035] Figure 2 This is a schematic diagram showing the location of the data acquisition component in a tire durability test method that simulates actual tire shoulder damage conditions according to one or more embodiments of the present invention.

[0036] Figure 3 This is a schematic diagram of the sudden change in air pressure when the tire shoulder is damaged, in a tire durability test method that simulates actual tire shoulder damage conditions according to one or more embodiments of the present invention.

[0037] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0038] Among them: 1. Tires, 2. Data acquisition components. Detailed Implementation

[0039] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0040] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0041] As described in the background section, the existing tire testing process does not take into account the problem of tire shoulder damage. In order to solve the above technical problem, the present invention proposes a tire durability testing method that simulates the actual damage conditions of the tire shoulder.

[0042] Example 1

[0043] In a typical embodiment of the present invention, reference is made to Figure 1 As shown, a tire durability test method simulating actual tire shoulder damage conditions includes the following:

[0044] 1) Set a data acquisition component 2 in the tire 1 used in the actual vehicle to obtain the actual temperature information, actual load information, air pressure information and real-time speed of the actual vehicle tire before the tire shoulder is damaged; 2) Input the obtained actual temperature information, actual load information and air pressure information of the actual vehicle tire before the tire shoulder is damaged, and the real-time speed of the tire into the tire laboratory durability testing machine, and determine the test conditions of the test tire according to the above data, and install the data acquisition component 2 in the test tire to obtain relevant information of the test tire, including load information, etc.

[0045] 3) Start the test. After the test tire has traveled a set distance, such as 10,000 kilometers, check the tire pressure and appearance. If the test tire is damaged, record the relevant test data and determine the cause of the damage.

[0046] 4) Improve the tires based on the causes of damage to the test tires, and test the improved tires according to step 3). Confirm the effectiveness by the damage time and damage form, and record the improvement ratio A in the laboratory test. After the test, put the improved tires into the original working condition market and verify the tire service life extension percentage through actual use. Record the actual use improvement ratio B to improve the accuracy of the method.

[0047] The testing method provided in this embodiment obtains the actual temperature, actual load, and air pressure information of the tire shoulder before damage by setting a data acquisition component in the tire used in the actual vehicle, and obtains the real-time rotation speed of the tire. The above information is used as the test conditions for the test tire. In other words, the laboratory durability test conditions are adjusted by using the actual damage conditions at the tire shoulder position to ensure that the test results can accurately reflect the cause of tire failure in actual use. This facilitates tire improvement, improves tire structure, makes the improvement more targeted, and improves tire durability.

[0048] Among them, reference Figure 2 As shown, the data acquisition component is attached to the center of the tire liner, and the centerline of the data acquisition component is set along the tangent of the center of the tire liner.

[0049] In step 1), the data acquisition component 2 includes a temperature sensor, an acceleration sensor, and a pressure sensor. The temperature sensor, acceleration sensor, and pressure sensor are integrated (located in the same housing). The data acquisition component 2 is connected to the controller via wireless signal transmission, eliminating the need for wiring and preventing damage to the tire structure. These three sensors are integrated into one unit.

[0050] The data acquisition component 2 includes a temperature sensor, an acceleration sensor, and a pressure sensor. These three sensors are integrated into one unit, which is convenient to install, occupies a small area, and will not affect the normal use of the tire. The acceleration sensor can obtain the actual load information, which is helpful to limit the load requirements during the test.

[0051] It needs to be explained that in step 1), the reference Figure 3 As shown, when the tire shoulder is suddenly damaged, the tire pressure of tire 1 will change abruptly, drop rapidly, and trigger an alarm. The actual temperature, load, and pressure information of the actual vehicle tire before the tire shoulder is damaged can be determined by using the actual temperature information, load information, and pressure information of the actual vehicle tire before the tire pressure changes abruptly.

[0052] It should be noted that the actual load information is obtained by combining the acceleration data obtained by the acceleration sensor with the contact duration during tire travel and the arc length of tire 1. The contact duration during tire travel is determined based on the Z-axis signal of the acceleration sensor. This has been disclosed in Chinese patent application CN2024107162922 for the drum calibration method and system of intelligent tire load model.

[0053] The real-time rotational speed of the tire is obtained from an acceleration sensor. The tire generates various periodic vibrations during rotation, with the main frequency components including: the fundamental rotational frequency (…). fRot: This is caused by the change in centrifugal force per revolution of the tire or the impact between the tire tread and the ground. The frequency is equal to the rotational speed (Hz). The real-time rotational speed of the tire can be calculated based on the data obtained from the acceleration sensor. This is existing technology and will not be elaborated further.

[0054] It should be noted that the controller is a standalone controller, which can be a PLC controller or other types of controller. The controller is installed in the vehicle to receive and store relevant information; or, the controller is the control center of the vehicle where the tire is located, which is useful for recording relevant information when the tire shoulder is damaged.

[0055] In step 2), the test conditions for the test tires include:

[0056] Temperature: The ambient temperature of the test tire was ±3℃, based on the actual temperature of the tire on the actual vehicle before the tire shoulder was damaged.

[0057] Load: The actual load information of the actual vehicle tires before tire shoulder damage is used as the load value of the test tire;

[0058] Air pressure: The actual air pressure of the vehicle's tires before the tire shoulder was damaged was used as the air pressure value of the test tire;

[0059] Rotational speed: The real-time rotational speed of the actual vehicle tire before tire shoulder damage was used as the speed value of the test tire;

[0060] The temperature, load, air pressure, and real-time speed of the test tire are calibrated by the data acquisition component 2 installed inside the test tire. Taking the air pressure of the test tire as an example, after the air pressure is determined by the tire laboratory durability testing machine, if the air pressure collected by the data acquisition component does not reach the set test value, the test personnel need to check the test tire to see if there are any problems such as air leakage.

[0061] In addition, the test conditions also include a preset operating mileage (such as an equivalent of 100,000 kilometers).

[0062] Thus, the ambient temperature of the test tire is determined based on the actual temperature information before the tire shoulder is damaged, the actual load information before the tire shoulder is damaged is used as the load value of the test tire, the actual air pressure information before the tire shoulder is damaged is used as the air pressure value of the test tire, and the real-time rotation speed of the tire before the tire shoulder is damaged is used as the speed value of the test tire, so as to ensure the accuracy of the test conditions and test results.

[0063] In step 3), when visually inspecting the test tire, check the tread, sidewall, ply, airtight layer, belt layer, bead delamination, ply cracks, cord peeling, cord breakage, chipping, joint cracking, crazing, and abnormal deformation of the tire body to ensure that the test tire is not damaged.

[0064] In step 3), when it is determined that the test tire has external damage, the damaged area of ​​the test tire is cut into sections to determine the cause of the damage, whether it is thermal fatigue damage or stress damage at the end of the tire belt layer.

[0065] In step 4), the tire is improved according to the cause of the test tire damage, including the following: if it is determined that the test tire is damaged due to thermal fatigue, the tire composition is changed by reducing heat generation; if it is determined that the test tire is damaged due to stress at the end of the tire belt layer, the structure of the belt layer is adjusted to reduce stress. In this way, the tire structure is improved according to the cause of the test tire damage, which is more targeted and improves the thermal fatigue resistance or reduces stress of the improved tire.

[0066] In addition, in step 4), the laboratory test improvement ratio A refers to the ratio of the operating time of the test tire before the improvement to the operating time after the test, and the actual use improvement ratio B refers to the ratio of the operating time of the tire used in the actual vehicle to the operating time after the improvement and its release to the market.

[0067] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A tire durability testing method simulating actual tire shoulder damage conditions, characterized in that, Includes the following: When a tire shoulder is suddenly damaged, the tire pressure of the actual vehicle will change abruptly. The actual temperature, load, pressure and real-time rotation speed of the actual vehicle tire before the tire shoulder is damaged can be determined by using the actual temperature, load, pressure and real-time rotation speed of the actual vehicle tire before the tire pressure changes abruptly. Data acquisition components are installed in the tires used in actual vehicles to obtain the actual temperature, actual load, air pressure and real-time rotation speed of the actual vehicle tires before the tire shoulder is damaged. The actual temperature, load, air pressure, and real-time rotation speed of the actual vehicle tires before the tire shoulder damage are obtained are input into the tire laboratory durability testing machine, and the test conditions of the test tires are determined based on the above data. The test begins, and the test tires are inspected every set distance. The tire pressure and appearance are checked. If any damage is found on the test tires, the relevant test data is recorded and the cause of the damage is determined. Based on the cause of the test tire damage, the tire was improved, the improved tire was tested, and then released to the market.

2. The tire durability testing method simulating actual tire shoulder damage conditions according to claim 1, characterized in that, The test conditions for the test tires include: Temperature: The ambient temperature of the test tire was ±3℃, based on the actual temperature of the tire on the actual vehicle before the tire shoulder was damaged. Load: The actual load information of the actual vehicle tires before tire shoulder damage is used as the load value of the test tire; Air pressure: The actual air pressure of the vehicle's tires before the tire shoulder was damaged was used as the air pressure value of the test tire; Rotation speed: The real-time rotation speed of the actual vehicle tire before the tire shoulder was damaged was used as the speed value of the test tire.

3. The tire durability testing method simulating actual tire shoulder damage conditions according to claim 1, characterized in that, The temperature, load, air pressure, and real-time rotation speed of the actual vehicle tires are acquired through data acquisition components installed inside the actual vehicle tires.

4. The tire durability testing method simulating actual tire shoulder damage conditions according to claim 1, characterized in that, The data acquisition component is attached to the center of the tire liner of the actual vehicle, and the center line of the data acquisition component is set along the tangent of the center of the tire liner.

5. The tire durability testing method simulating actual tire shoulder damage conditions according to claim 1, characterized in that, The data acquisition component includes a temperature sensor, an acceleration sensor, and a pressure sensor, which are integrated together. The data acquisition component is connected to the controller via wireless signal transmission.

6. The tire durability testing method simulating actual tire shoulder damage conditions according to claim 5, characterized in that, The actual load information is obtained by combining the acceleration data acquired by the acceleration sensor with the contact time and the arc length of the tire during driving. The contact time during tire driving is determined based on the Z-axis signal of the acceleration sensor. The real-time rotational speed of the vehicle's tires is obtained using an acceleration sensor.

7. The tire durability testing method simulating actual tire shoulder damage conditions according to claim 1, characterized in that, When performing a visual inspection on the test tire, the following should be checked: tread, sidewall, ply, airtight layer, belt layer, bead delamination, ply cracks, cord peeling, cord breakage, chipping, joint cracking, crazing, and abnormal tire deformation.

8. The tire durability testing method simulating actual tire shoulder damage conditions according to claim 1, characterized in that, When it is determined that the test tire has external damage, the damaged area of ​​the test tire is cut into sections, and the cause of the damage is determined by the cross-section, whether it is thermal fatigue damage or stress damage at the end of the tire belt layer.

9. The tire durability testing method simulating actual tire shoulder damage conditions according to claim 8, characterized in that, The improvement of the tires based on the causes of damage to the test tires includes the following: If it is determined that the test tire is damaged due to thermal fatigue, the tire composition is changed by reducing heat generation; if it is determined that the test tire is damaged due to stress at the end of the tire belt layer, the structure of the belt layer is adjusted to reduce the stress.

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