Retread Tire Shoulder Dimples for Heat-Driven Tread Separation
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Solution Overview
Problem
Retread tires often suffer damage due to heat-generated separation of the recapped tread from the base tire, leading to durability issues.
Innovation Solution
Incorporating a plurality of dimples on the first buttress surface of the recapped tread, with maximum diameters between 2 to 5 mm and depths between 1 to 3 mm, to reduce rubber volume, enhance heat dissipation, and prevent cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the recapped tread is adhered to the base tire with sufficient rubber volume, then the adhesion strength is improved, but the heat generation increases causing separation damage
Solution Approach 1:
The patent applies local quality by creating dimples at specific locations on the buttress surface rather than uniformly modifying the entire surface. The dimples are concentrated in the shoulder region where heat generation and separation damage occur most frequently, allowing localized heat dissipation without compromising overall adhesion strength.
Solution Approach 2:
The dimpled surface creates a porous structure on the buttress surface that facilitates heat dissipation. The cavities formed by dimples allow heat to escape from the rubber layer, reducing temperature buildup while maintaining the structural integrity and adhesion properties of the recapped tread.
2Temperature
If the rubber volume is reduced to decrease heat generation, then the temperature is lowered, but the adhesion strength decreases
Solution Approach 1:
Instead of uniformly reducing rubber volume, the patent applies local quality by creating dimples only in specific regions. This localized modification reduces heat generation in critical areas while preserving rubber volume and adhesion strength in other regions where it is needed for bonding.
Solution Approach 2:
The buttress surface is segmented into multiple dimpled regions rather than uniformly modified. This segmentation allows different zones to serve different functions - some areas with dimples for heat dissipation, while maintaining adequate rubber volume for adhesion in bonding-critical regions.
3Duration of action of stationary object
If the recapped tread is designed with sufficient thickness, then the durability is improved, but the heat dissipation is insufficient
Solution Approach 1:
The dimpled surface creates a porous structure that enhances heat dissipation capability. The cavities act as heat sinks and provide pathways for heat to escape from the thick rubber layer, enabling effective thermal management while maintaining the durability benefits of sufficient tread thickness.
Solution Approach 2:
The patent addresses heat dissipation by introducing a new dimension - surface topology modification through dimples. This three-dimensional surface structure provides additional heat dissipation pathways without reducing the overall thickness of the recapped tread, thereby maintaining durability while improving thermal performance.
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 dimples improve the durability of separation and heat dissipation, effectively preventing cracking and enhancing the overall durability of the retread tire.
Implementation Method 1
enhance heat dissipation
Data Source
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AI summary
A retread tire (1) includes a base tire (1a), and a recapped tread (2a) adhered to the base tire. The recapped tread includes a first tread edge (T1), and a first buttress surface (11) extending inwardly from the first tread edge in the tire radial direction. The first buttress surface is provided with a plurality of dimples (15). Each of the plurality of dimples has a maximum diameter in a range from 2 to 5 mm and a maximum depth in a range from 1 to 3 mm.