Tyre Carcass Sleeve Variable Overlap Width Design
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Solution Overview
Problem
Current tyre manufacturing processes face challenges in reducing cycle-time and improving qualitative consistency, fatigue strength, and ride comfort due to the resistance of carcass plies during separation from the deposition surface and the impact of overlap width on structural flexibility.
Innovation Solution
A process and apparatus that form a carcass sleeve with overlapping strip-like elements, where the overlap width is reduced in terminal zones while maintaining sufficient width in central zones, allowing for easier separation from the deposition surface and facilitating uniform radial expansion without mechanical interference, thereby enhancing structural flexibility and reducing cycle-time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniform overlap width is maintained across all zones of the carcass sleeve, then structural integrity is ensured, but separation from the deposition surface becomes difficult and cycle-time increases
Solution Approach 1:
The patent applies different overlap widths to different zones of the carcass sleeve: a first overlap width in terminal zones (near beads) and a second, greater overlap width in intermediate zones. This local differentiation allows easier separation in terminal zones while maintaining structural integrity in intermediate zones, thereby reducing cycle-time without compromising overall reliability.
2Loss of time
If overlap width is reduced in terminal zones, then separation from deposition surface is facilitated and cycle-time is reduced, but structural flexibility may be compromised
Solution Approach 1:
The patent strategically reduces overlap width only in terminal zones where separation is needed, while maintaining sufficient overlap width in intermediate zones to preserve structural flexibility and integrity. This localized approach optimizes both separation ease and structural performance.
Solution Approach 2:
The carcass sleeve is divided into distinct zones (terminal zones near beads and intermediate zones) with different overlap characteristics. This segmentation allows each zone to be optimized for its specific function: terminal zones for easy separation and intermediate zones for structural stability.
3Reliability
If greater overlap width is used, then structural integrity is improved, but stress concentrations increase during shaping and mounting
Solution Approach 1:
The patent reduces overlap width in terminal zones where stress concentrations would otherwise be highest during shaping and mounting operations. This local reduction minimizes stress concentrations while the maintained overlap in intermediate zones preserves overall structural integrity.
Data Source
AI summary
An apparatus for building tyres for vehicle wheels are described. A substantially cylindrical carcass sleeve, having at least one carcass ply, includes consecutively adjacent strip-like elements laid one after the other around the circumferential extension of a substantially cylindrical deposition surface. Circumferentially consecutive strip-like elements laid one after the other form overlap zones along respective longitudinal edges superimposed on each other. Each overlap zone has, along a longitudinal extension thereof, terminal sections that are laterally opposite with respect to an intermediate section. The intermediate section of each overlap zone has greater width than the width of the terminal sections.