Pneumatic Tire Outer Apex High Thermal Conductivity Rubber
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Solution Overview
Problem
Pneumatic tires with an outer apex face challenges in achieving improved durability due to increased rubber gauge, which hampers heat conduction during vulcanization, leading to suboptimal adhesion and handling stability.
Innovation Solution
A rubber composition with a thermal conductivity of 0.45 W/m·K or higher, incorporating pitch-based carbon fiber and graphite, is used for the outer apex to enhance heat conduction and durability while maintaining handling stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rubber gauge of the outer apex is increased to improve durability, then the adhesion and handling stability deteriorate due to hampered heat conduction during vulcanization
Solution Approach 1:
The patent changes the thermal conductivity parameter of the rubber composition by adding specific fillers (graphite 1-30 parts, carbon black 30-100 parts per 100 parts rubber). This allows heat to conduct properly even through increased rubber gauge, resolving the contradiction between durability (thicker rubber) and adhesion (heat conduction).
Solution Approach 2:
The patent creates a composite rubber material by combining rubber with specific ratios of graphite and carbon black fillers. This composite structure maintains thermal conductivity while providing the mechanical strength needed for durability, thus resolving the contradiction between thickness for durability and heat conduction for adhesion.
2Strength
If the rubber gauge of the outer apex is increased to improve durability, then the thermal conductivity deteriorates leading to suboptimal vulcanization
Solution Approach 1:
The patent specifically adjusts the thermal conductivity parameter by incorporating graphite (1-30 parts) and carbon black (30-100 parts per 100 parts rubber). These fillers maintain thermal conductivity at acceptable levels even when rubber gauge is increased for durability.
Solution Approach 2:
The patent develops a composite rubber formulation with controlled filler content to maintain thermal properties. The composite structure allows increased rubber thickness for durability while the conductive fillers ensure proper heat transfer during vulcanization.
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 high thermal conductivity rubber composition improves durability and handling stability by optimizing heat conduction during vulcanization, reducing adhesion issues and enhancing the tire's performance.
Implementation Method 1
a rubber composition with a thermal conductivity of 0.45 W/m·K or higher, incorporating pitch-based carbon fiber and graphite, is used for the outer apex to enhance heat conduction
Data Source
Figure 1~2
Figure 3
AI summary
The present invention provides a pneumatic tire that provides improved durability while maintaining or improving good handling stability. The present invention relates to a pneumatic tire including an outer apex formed from a rubber composition, the rubber composition having a thermal conductivity of 0.45 W/m·K or higher.