Pneumatic Tire Sidewall Two-Dimensional Code Durability
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Solution Overview
Problem
The readability of two-dimensional codes on pneumatic tire sidewalls decreases over time due to deformation and cracking of dot holes, leading to reduced durability and increased error in code reading.
Innovation Solution
A pneumatic tire design with a two-dimensional code on the sidewall featuring a dot pattern made of gray scale elements, where the side rubber thickness is increased in the dot pattern region to 110-150% of the average thickness, and the dot pattern region is formed in a specific curvature range, reducing strain and micro-crack formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dot holes are engraved vertically from the sidewall surface to form a two-dimensional code, then the code can be effectively managed and remains readable when the tire is new, but the holes become generation nuclei for cracks and durability decreases
Solution Approach 1:
The patent applies local quality by creating a localized thickened region (reinforcement layer) at the dot pattern position on the sidewall. This reinforcement layer has a thickness of 1.5-3.0 mm, which is greater than the average sidewall thickness, providing localized structural support where the dot holes are formed. This allows the code to be readable while preventing crack propagation in the critical area without affecting the overall tire design.
Solution Approach 2:
The patent implements beforehand cushioning by forming a reinforcement layer in advance at the position where dot holes will be engraved. This pre-formed thickened region acts as a buffer that absorbs and distributes stress concentrations around the dot holes before cracks can initiate and propagate. The reinforcement layer is created during the tire manufacturing process before the tire enters service, ensuring durability from the start.
2Reliability
If the sidewall thickness is increased to prevent crack formation, then durability improves, but the tire weight and manufacturing complexity increase
Solution Approach 1:
The patent avoids increasing the overall tire weight by applying the thickness increase locally only at the dot pattern position rather than throughout the entire sidewall. The reinforcement layer has a thickness of 1.5-3.0 mm at the code location, while the rest of the sidewall maintains its normal optimized thickness. This localized approach provides the necessary durability improvement without adding excessive weight.
3Loss of information
If the two-dimensional code is engraved on the sidewall, then tire information can be read, but the code becomes harder to read as the tire rolls and load acts on it
Solution Approach 1:
The reinforcement layer is formed beforehand at the dot pattern position to cushion and stabilize the sidewall structure during tire operation. This pre-formed thickened region prevents deformation and maintains the geometric integrity of the dot holes even when load is applied and the tire rolls, ensuring the code remains readable throughout the tire's service life.
Solution Approach 2:
The patent specifies that the dot pattern should be formed on a region of the sidewall with a radius of curvature between 50-200 mm. This curvature requirement ensures that the sidewall surface at the code location is relatively flat and stable, reducing deformation under load and maintaining code readability. The controlled curvature helps distribute stresses evenly around the dot holes.
Data Source
AI summary
One of sidewalls of a pneumatic tire is engraved with a two-dimensional code on a side rubber surface. The two-dimensional code is formed of a dot pattern made up of two types of gray scale elements distinguishable from each other by irregularities on the surface. The side rubber has a thickness at an engraving position of the two-dimensional code from 110 to 150% the average thickness of the entire side rubber.