Tire Side Reinforcing Rubber Layer with High Tensile Stress
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Solution Overview
Problem
Current tires face challenges in enhancing run flat durability, side cut resistance, and steering stability, particularly in passenger cars, as existing technologies do not adequately address the need for improved performance in these areas without compromising rolling resistance.
Innovation Solution
The tire design incorporates a side reinforcing rubber layer and bead filler with a specific rubber composition having a tensile stress of 6.2 MPa or more at 50% elongation at 180°C, combined with a carcass layer featuring organic fiber cords with an intermediate elongation of 4.2% or less and toughness of 45 cN·%/dtex, to enhance durability and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a side reinforcing rubber layer and bead filler with high tensile stress rubber composition is used, then run flat durability is improved, but rolling resistance increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the tensile stress of the rubber composition at 50% elongation at 180°C to be 6.2 MPa or more. This specific parameter threshold optimizes the balance between run flat durability and rolling resistance, ensuring the rubber layer provides sufficient strength for run flat performance while maintaining energy efficiency during normal operation.
Solution Approach 2:
The patent employs composite materials by combining the rubber composition with organic fiber cords having specific intermediate elongation (4.2% or less) and toughness (45 cN·%/dtex or more). This composite structure in the side reinforcing layer and bead filler creates a synergistic effect that enhances run flat durability without excessively increasing rolling resistance.
2Strength
If a side reinforcing rubber layer with high tensile stress rubber composition is used, then side cut resistance is improved, but rolling resistance increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the tensile stress of the rubber composition at 50% elongation at 180°C to be 6.2 MPa or more. This specific parameter threshold optimizes the balance between side cut resistance and rolling resistance, ensuring the rubber layer provides sufficient strength for cut resistance while maintaining energy efficiency during normal operation.
Solution Approach 2:
The patent employs composite materials by combining the rubber composition with organic fiber cords having specific intermediate elongation (4.2% or less) and toughness (45 cN·%/dtex or more). This composite structure in the side reinforcing layer creates a synergistic effect that enhances side cut resistance without excessively increasing rolling resistance.
3Stability of the object's composition
If a side reinforcing rubber layer with high tensile stress rubber composition is used, then steering stability is improved, but rolling resistance increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the tensile stress of the rubber composition at 50% elongation at 180°C to be 6.2 MPa or more. This specific parameter threshold optimizes the balance between steering stability and rolling resistance, ensuring the side reinforcing layer provides sufficient structural support for stable steering while maintaining energy efficiency during normal operation.
Solution Approach 2:
The patent employs composite materials by combining the rubber composition with organic fiber cords having specific intermediate elongation (4.2% or less) and toughness (45 cN·%/dtex or more). This composite structure enhances the structural integrity of the side wall, improving steering stability without excessively increasing rolling resistance.
4Reliability
If organic fiber cords with low intermediate elongation and high toughness are used in the carcass layer, then run flat durability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by specifying precise ranges for intermediate elongation (4.2% or less) and toughness (45 cN·%/dtex or more) of the organic fiber cords. These parameter specifications enable manufacturers to select from standardized fiber cord products that meet the requirements, balancing performance improvement with manufacturing feasibility.
Data Source
AI summary
The present invention provides a tire improved in the run flat durability, having at least one member selected from the group consisting of a side reinforcing rubber layer and a bead filler using a rubber composition having a tensile stress at 50% elongation at 180° C. (M50) of 6.2 MPa or more as a vulcanized rubber physical property.