Tire Tread Wear Test Method Using Low Slip Ratio
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Solution Overview
Problem
Existing methods for evaluating the wear resistance of rubber materials as tire tread, such as the Laboratory Abrasion Tester LAT100, often fail to accurately predict actual wear resistance performance due to differences in testing conditions between laboratory and real-world vehicle usage.
Innovation Solution
A test method using the LAT100 with specific conditions: contact pressure of 0.1 to 1 MPa, rolling speed of 1 to 50 km/h, rolling distance of 10 to 30 km, and a slip ratio of 3.5% or less, to simulate low severity conditions, ensuring accurate prediction of wear resistance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional laboratory abrasion test is conducted using the LAT100, then the wear resistance performance can be evaluated, but the predicted wear resistance does not accurately match the actual wear resistance of the tire
Solution Approach 1:
The patent applies parameter changes by modifying the test conditions (contact pressure, rolling speed, rolling distance, slip ratio) to simulate low severity conditions that match actual vehicle running environments. This resolves the contradiction by adjusting laboratory test parameters to achieve both measurable wear resistance and high correlation with actual performance.
2Strength
If the contact pressure is increased to simulate high severity conditions, then the wear due to crack growth is emphasized, but the correlation with actual vehicle running test results decreases
Solution Approach 1:
The patent maintains contact pressure within 0.1 to 1 MPa to simulate low severity conditions, preventing excessive emphasis on crack growth wear while still enabling wear resistance evaluation. This parameter control resolves the contradiction by matching laboratory conditions to actual vehicle running environments.
3Productivity
If the rolling speed is increased to reduce test time, then the productivity is improved, but the correlation with actual low severity running conditions may be compromised
Solution Approach 1:
The patent optimizes rolling speed within 1 to 50 km/h to balance test efficiency with accuracy. This range allows reasonable test completion time while maintaining correlation with actual vehicle running conditions, resolving the contradiction between productivity and measurement precision.
4Measurement precision
If the rolling distance is extended to improve wear evaluation accuracy, then the measurement precision is improved, but the test time and energy consumption increase
Solution Approach 1:
The patent sets rolling distance within 10 to 30 km to achieve sufficient wear evaluation accuracy while controlling test duration. This optimized range resolves the contradiction by providing adequate wear measurement without excessive time investment.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method provides a high correlation between laboratory and actual vehicle wear resistance results, allowing for reliable evaluation and improvement of tire tread rubber compositions.
Implementation Method 1
the outer circumferential surface of a cylindrical test piece of the rubber material is brought into contact with the surface of the rotating abrasive disc so as to roll on the surface of the abrasive disc
Implementation Method 2
a method in which a rubber material is abraded by using an indoor wear testing machine
Data Source
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AI summary
A test method of accurately evaluating wear resistance performance of a rubber material when used as a tread rubber of a tire, comprises the steps of: preparing a test piece of the rubber material having a ground contact surface extending in a circumferential direction; abrading the ground contact surface by rolling the test piece on a running surface of a wear testing machine at a slip ratio of not more than 3.5%; and evaluating the wear resistance performance of the test piece by comparing the amount of wear of the test piece with a predetermined threshold value.