Retreaded Tire Shoulder Groove Dimples for Peeling Resistance
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Solution Overview
Problem
Retreaded tires often experience damage due to tread rubber peeling off from the base tire, particularly at the shoulder portions where heat generation is high.
Innovation Solution
Incorporating a first shoulder circumferential groove with a plurality of dimples on its groove surface to enhance heat dissipation and improve adhesion between the tread rubber and the base tire.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tread rubber is adhered to the base tire without additional groove structures, then the manufacturing process is simple, but the peeling resistance of the tread rubber is poor
Solution Approach 1:
The groove surface is equipped with dimples creating a porous-like structure that enhances adhesion between the tread rubber and base tire through increased surface area and mechanical interlocking, thereby improving peeling resistance without adding complex external components
Solution Approach 2:
The invention transitions from a flat groove surface to a three-dimensional structure with dimples, utilizing the vertical dimension to create anchoring effects that prevent peeling while maintaining overall structural simplicity
2Temperature
If the shoulder circumferential groove has a smooth groove surface, then the manufacturing process is simple, but the heat dissipation performance is insufficient
Solution Approach 1:
The dimples create a porous-like surface structure on the groove that significantly enhances heat dissipation through increased surface area and improved convection, while the regular pattern of dimples allows for straightforward manufacturing using conventional molding techniques
Solution Approach 2:
The dimples introduce curved surfaces to the otherwise flat groove bottom, and curved surfaces are more effective at dissipating heat through convection and radiation compared to flat surfaces, while still being manufacturable with standard tools
3Productivity
If the groove surface is flat without dimples, then the vulcanization process time is longer, but the process control is simpler
Solution Approach 1:
The dimpled structure creates a porous-like surface that allows for more efficient heat and pressure distribution during vulcanization, reducing the time required for complete curing while the regular pattern of dimples keeps the molding process straightforward
Solution Approach 2:
The dimples are pre-formed in the mold, creating surface features before vulcanization that actively promote faster curing by improving contact and heat transfer, thus accelerating the process without requiring complex real-time control
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 enhance peeling resistance, reduce noise, and shorten vulcanization process time while maintaining steering stability and durability.
Implementation Method 1
the first shoulder circumferential groove has a groove surface provided with a plurality of dimples... the dimples enhance peeling resistance, reduce noise, and shorten vulcanization process time
Data Source
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AI summary
A retreaded tire includes a base tire (1a) and a tread rubber (2a) for retread adhered to the base tire. The tread rubber (2a) includes a first tread edge (T1) and a first shoulder circumferential groove (11) adjacent to the first tread edge (T1) and extending continuously in a tire circumferential direction. The first shoulder circumferential groove (11) has a groove surface provided with a plurality of dimples (25).