Bead Stiffener for Low Aspect Ratio Tire Durability
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Solution Overview
Problem
Existing bead reinforcement techniques are not effective for tires with low aspect ratio, as they either do not cover the entire outer surface of the bead or have low efficiency, leading to issues with durability and dynamic performance.
Innovation Solution
A bead reinforcing device that covers the entire outer surface of the tire bead with a textile-based bead stiffener, including an outer and inner stiffener part, and a rubber sheet to prevent separation, specifically designed for tires with low aspect ratio to improve durability and dynamic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing bead reinforcement techniques are used, then the bead is partially covered, but the entire outer surface of the bead is not covered, leading to insufficient durability and dynamic performance in low aspect ratio tires
Solution Approach 1:
The bead reinforcing device is divided into multiple segments: an outer bead reinforcing layer that covers the entire outer surface of the bead, an inner bead reinforcing layer that covers the inner surface, and a bead filler. This segmentation allows each layer to perform its specific function optimally, with the outer layer providing comprehensive coverage for durability while adapting to low aspect ratio tire geometries
Solution Approach 2:
The invention transitions from traditional single-layer or partial coverage reinforcement to multi-layer reinforcement that covers the bead in multiple dimensions - the outer layer wraps around the entire outer circumference, the inner layer reinforces the inner surface, and the bead filler provides core support. This multi-dimensional approach ensures complete coverage and enhanced performance
2Productivity
If traditional bead reinforcement methods are applied to low aspect ratio tires, then the structure may be overly complex, but the efficiency and dynamic characteristics are not improved
Solution Approach 1:
The bead reinforcing device is designed as a universal solution that can be applied to low aspect ratio tires with standardized configurations. The outer bead reinforcing layer, inner bead reinforcing layer, and bead filler work together as an integrated multi-functional system that simultaneously provides structural support, durability enhancement, and dynamic performance improvement without requiring complex custom designs
Solution Approach 2:
The invention optimizes parameters such as the material composition of each layer, the thickness of the outer and inner reinforcing layers, and the configuration of the bead filler to achieve high productivity and dynamic characteristics. By carefully controlling these parameters, the device delivers efficient performance while maintaining manageable structural complexity
3Reliability
If the bead is reinforced to improve durability, then the tire can withstand various internal pressures and loads, but the weight of the tire increases
Solution Approach 1:
The bead reinforcing device utilizes composite material structures where the outer bead reinforcing layer and inner bead reinforcing layer are made from different materials optimized for their specific functions. The bead filler also employs composite construction. This composite approach provides the necessary durability to withstand internal pressures and loads while minimizing weight compared to using a single heavy material throughout
Data Source
Figure 1~2b
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AI summary
Disclosed herein is a bead reinforcing device for pneumatic tires, which includes a bead (100) forming a circumference of a tire as a portion where the tire is in contact with a wheel, a carcass formed to cover the bead from its inside to its outside and forming an entire frame of the tire, and a bead stiffener (210) formed to cover an entire outer surface of the bead (100).