Thin Tire Inner Liner Structure for Low Air Permeation
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Solution Overview
Problem
Existing tires face challenges in maintaining air pressure due to air permeation through the inner liner and insulation layers, leading to issues such as warp and exfoliation, which affect fuel efficiency and performance.
Innovation Solution
A tire design incorporating an inner liner with a rubber composition containing recovered carbon black, having an air permeation coefficient less than 18×10−11 cm3·cm/(cm2·s·cmHg) and a thickness of 1.5 mm or less, along with a loss tangent of 0.22 or less, to enhance air permeation suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the inner liner is thinned to improve fuel efficiency, then weight and rolling resistance are reduced, but air permeation resistance deteriorates
Solution Approach 1:
The invention changes the material parameters of the inner liner by incorporating specific rubber compounds with low air permeability coefficients and controlling the loss tangent of the complex structure, achieving both thinness and high air permeation resistance
Solution Approach 2:
The invention uses a composite structure of the inner liner and insulation layer, where the insulation material is selected and designed to work synergistically with the inner liner to provide both mechanical strength and air permeation resistance in a thin configuration
2Loss of energy
If the inner liner and insulation are thinned to reduce heat generation, then fuel efficiency is improved, but shape stability deteriorates
Solution Approach 1:
The invention optimizes the loss tangent parameter of the complex structure to be 0.22 or less, which directly controls heat generation while maintaining shape stability through proper material selection and structural design
Solution Approach 2:
The invention applies different material properties to different parts of the structure, with the insulation layer having specific thermal and mechanical properties that differ from the inner liner, creating local optimization for both heat reduction and stability
3Ease of manufacture
If the insulation is made from recovered carbon black to reduce cost, then manufacturing cost is reduced, but air permeation resistance may deteriorate
Solution Approach 1:
The invention specifies precise parameter ranges for the rubber composition including air permeability coefficient and loss tangent, ensuring that even with recovered carbon black, the air permeation resistance meets required standards
Solution Approach 2:
The invention utilizes recovered carbon black as a filler material in the insulation layer, converting a waste product into a valuable resource while maintaining or improving the functional performance of the tire structure
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 design improves air permeation resistance, reduces heat generation, and enhances shape stability, resulting in better fuel efficiency and reduced rolling resistance.
Implementation Method 1
an inner liner as an air permeation-suppressing layer for retaining air pressure of the tire
Implementation Method 2
a loss tangent at 70° C., 70° C. tan δ, of a complex of the insulation and the inner liner is 0.22 or less
Data Source
AI summary
Provided is a tire comprising an inner liner and an insulation touching the inner liner on an outer side of the inner liner in a tire radial direction, wherein the insulation is composed of a rubber composition comprising a recovered carbon black, wherein an air permeation coefficient of a rubber composition constituting the inner liner is less than 18×10−11 cm3·cm/(cm2·s·cmHg), wherein a thickness of the inner liner on a tire equatorial plane is 1.5 mm or less, and wherein a loss tangent at 70° C., 70° C. tan δ, of a complex of the insulation and the inner liner is 0.22 or less.