Tire Sidewall 2D Code Structure for Long-Term Readability
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Solution Overview
Problem
The readability of two-dimensional codes on pneumatic tires decreases over time due to cracks and irregularities in the dot holes, making it difficult to manage the tire effectively.
Innovation Solution
A pneumatic tire with a two-dimensional code engraved on the sidewall using a diene rubber side rubber with a specific ratio of butadiene rubber to carbon, and dot holes with a predetermined hole depth and hole wall angle, which are designed to maintain readability even after long-term use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If dot holes are engraved on the sidewall portion to form a two-dimensional code, then the tire can be effectively managed with readable information, but cracks occur and develop in the dot holes over time making the code harder to read
Solution Approach 1:
The patent changes the physical parameters of the dot holes by specifying precise depth ranges (0.3-1.0mm) and hole wall angle ranges (10-50 degrees). These parameter optimizations balance the code readability requirement with the structural integrity of the sidewall rubber, preventing crack propagation while maintaining distinguishable gray scale elements.
Solution Approach 2:
The patent applies different structural qualities to different regions of the dot holes. The hole wall angle varies from 10-50 degrees to create optimal light reflection characteristics for code readability while the depth (0.3-1.0mm) ensures sufficient contrast without compromising the overall sidewall strength. This localized quality optimization resolves the contradiction between code visibility and rubber durability.
2Measurement precision
If dot holes are made deeper to improve code distinction, then gray scale elements become more distinguishable, but cracks develop more easily in the thickness direction of the side rubber
Solution Approach 1:
The patent optimizes the dot hole depth parameter within a specific range of 0.3-1.0mm. This parameter change achieves sufficient light reflection difference for gray scale distinction while preventing the holes from being so deep that they compromise the structural strength of the sidewall rubber and initiate crack formation.
Solution Approach 2:
The patent specifies using diene rubber containing butadiene rubber with carbon (likely carbon black) as a filler. This composite material composition enhances the mechanical strength and crack resistance of the sidewall rubber while maintaining the optical properties needed for code readability, thus resolving the contradiction between measurement precision and structural strength.
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
The tire's two-dimensional code remains readable for an extended period due to the stable formation of dot holes, which suppresses the deterioration of the side rubber and prevents cracks from forming, thus maintaining the tire's durability and management efficiency.
Implementation Method 1
a two-dimensional code provided on a surface of the side rubber, the two-dimensional code having a configuration in which a dot pattern is formed by two types of gray scale elements including a light element and a dark element distinguishable from each other by irregularities on the surface and in which a dot hole is engraved using light
Data Source
AI summary
A pneumatic tire includes, on a surface of a side rubber provided on sidewall portions, a two-dimensional code in which a dot pattern is formed by two types of gray scale elements distinguishable from each other by irregularities on the surface. Dot holes are formed in the two-dimensional code, corresponding to dark elements of the gray scale elements. The side rubber is a diene rubber including butadiene rubber, and when A is a blended amount of the butadiene rubber relative to 100 parts by mass of the diene rubber contained in the side rubber and when B is a blended amount of carbon, a ratio A/B and a hole depth D (mm) from an opening of the dot hole to a hole bottom satisfies a relationship of 1.1≤(A/B)/D≤6.0.