Pneumatic Tire Sidewall Decorative Layer Strain Management
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Solution Overview
Problem
Pneumatic tires with decorative print layers face issues of cracking and peeling due to deformation strain and external damage, particularly in high-temperature environments, requiring improved durability and resistance.
Innovation Solution
A pneumatic tire design featuring a decorative portion with a print layer sandwiched between inner and outer layers, where specific storage modulus relationships and material properties ensure enhanced durability and resistance to external damage, even at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a decorative portion including a print layer is provided on the sidewall, then aesthetic appearance is improved, but cracks occur due to strain from tire deformation
Solution Approach 1:
The patent applies parameter changes by carefully controlling the storage modulus values of the print layer and protective layers at different temperatures (25°C and 80°C). The print layer is designed with lower storage modulus than the protective layers at both temperatures, allowing it to deform more easily and absorb strain, preventing cracks while maintaining aesthetic appearance.
Solution Approach 2:
The patent uses composite materials by creating a multi-layer structure consisting of a print layer sandwiched between two protective layers (inner and outer layers). This composite structure combines materials with different mechanical properties - the print layer provides aesthetic appearance while the protective layers provide strength and crack resistance, solving both the aesthetic and durability requirements.
2Shape
If a decorative portion including a print layer is provided on the sidewall, then aesthetic appearance is improved, but the print layer peels off when the tire contacts curbstones
Solution Approach 1:
The patent applies parameter changes by designing the protective layers to have higher storage modulus than the print layer at both 25°C and 80°C. This parameter difference creates a gradient structure where the protective layers remain rigid to resist external damage while the softer print layer can deform, preventing peeling when the tire contacts curbstones.
Solution Approach 2:
The patent uses composite materials by creating a multi-layer structure consisting of a print layer sandwiched between two protective layers (inner and outer layers). This composite structure combines materials with different mechanical properties - the print layer provides aesthetic appearance while the protective layers provide strength and crack resistance, solving both the aesthetic and durability requirements.
3Adaptability or versatility
If the decorative portion is used in high-temperature environments, then the tire can operate under severe conditions, but durability and resistance to external damage deteriorate
Solution Approach 1:
The patent applies parameter changes by specifying storage modulus values at both 25°C and 80°C to ensure the layered structure maintains its mechanical properties across a wide temperature range. The protective layers are designed to have higher storage modulus than the print layer at both temperatures, ensuring the structure remains effective from ambient to high-temperature operating conditions.
Data Source
AI summary
Provided is a pneumatic tire including, on an outer surface of its sidewall portion, a decorative portion including a print layer and inner and outer layers respectively disposed on tire inner and outer sides of the print layer. When storage moduli at 25° C. of the print, inner, and outer layers are respectively defined as E125′, E225′, and E325′, E125′<E225′ and E125′<E325′ are satisfied. When storage moduli at 80° C. of the print, inner, and outer layers are respectively defined as E180′, E280′, and E380′, and storage modulus variations α1, α2, and α3 at high temperature of the print, inner, and outer layers are respectively defined as α1=|E125′−E180′|/E125′, α2=|E225′−E280′|/E225′, and α3=|E325′−E380′|/E325′, α1<α2 and α1<α3, and E225′>E280′ and E325′>E380′ are satisfied.